ProMaxx Performance 440 heads

Posted By: dogdays

Re: ProMaxx Performance 440 heads - 10/01/14 07:32 PM

676 hp with a cast 440 crank and stock 400 rods!
Hows that for a cheap bottom end?

Even with the "short" 6.358" rods, R/S ratio still calcs out at 1.696.

The ProComp cylinder heads were done by MCH and were pretty trick, flow in the mid 300s. That's where the power came from.

R.

Posted By: BradH

Re: ProMaxx Performance 440 heads - 10/01/14 11:22 PM

Quote:

What do out of the box standard port victors flow? I know they are designed for something different than sidewinders but how do they compare?

"It depends..." It's not just variance between castings, but also the last generation Victors that came out in late 2011 (IIRC) got a better designed chamber (in theory), but a more restrictive intake port that is nowhere near as good as the original version in terms of basic flow #s.

The Procomps in the article linked above are seriously NOT stock, between MCH's CNC MW porting, plus Malik's filling of the port floor, etc. I've got a Procomp I've used as a "crash test dummy" for some porting and with a good valve job and an otherwise stock casting flowed 310-315 IIRC. I've done some basic porting while keeping pretty close to a standard port entry (nowhere near MW size) and pushed them to 340+ at .700". There are some old threads on here from right about a year ago where I posted those results, FWIW.

Posted By: Monte_Smith

Re: ProMaxx Performance 440 heads - 11/05/14 10:38 PM

Quote:

Remember a few years ago, a new US cylinderhead company called Patriot? They staked out the lower edge of the smallblock chevy market, made a decent aluminum head which got a lot of press because it was good but inexpensive.

Somewhere along the way they were bought and renamed as ProMaxx.

As their sbc and sbf heads were pretty good, I would guess that their BBM heads would be good too.

R.

^^^^^^^^^^This. ProMaxx, formerly Patriot Performance is located in Rainbow City Alabama. Been there a long time and is not going away anytime soon. Before it was Patriot, it was Alabama Cylinder Head, which has been in business for decades. When they moved more focus towards performance, it was renamed Patriot by then owner and before that, long time employee, Marty Witt. The company was recently sold to another individual, who changed the name to ProMaxx, but all the same people, including Marty Witt, still work there. All machine operation are done in house in Alabama and they have some very nice and very up to date equipment, with guys who can run it.

Monte

Posted By: funnycar65

Re: ProMaxx Performance 440 heads - 11/08/14 06:45 PM

Was seriously thinking about a pair of 440 Source Steaths but after reading about the Promaxx and Sidewinder heads now I got some more home work to do.Anyone ran these with the Edlebrock Victor intake yet?

Posted By: Dunnuck Racing

Re: ProMaxx Performance 440 heads - 11/08/14 08:11 PM

Quote:

Was seriously thinking about a pair of 440 Source Steaths but after reading about the Promaxx and Sidewinder heads now I got some more home work to do.Anyone ran these with the Edlebrock Victor intake yet?

I'm testing several combinations currently with the Sidewinder heads. I hope to have some more results with a few intakes soon.
Keith

Attached picture 8325397-NCM_0618.JPG

Posted By: RAMM

Re: ProMaxx Performance 440 heads - 11/09/14 01:19 AM

Quote:

I believe in either this month or last months Mopar Muscle they did a 451 build and use the ProMax heads. I dont remember all the details but I think they flowed around 340 on the intakes ? I know the eng made very good hp (like 675 I think) and torque. I will try to look it up when I get a chance. Ron

Use extreme discernment when reading this article. J.Rob

Posted By: RAMM

Re: ProMaxx Performance 440 heads - 11/09/14 01:27 AM

Quote:

676 hp with a cast 440 crank and stock 400 rods!
Hows that for a cheap bottom end?

Even with the "short" 6.358" rods, R/S ratio still calcs out at 1.696.

The ProComp cylinder heads were done by MCH and were pretty trick, flow in the mid 300s. That's where the power came from.

R.

Yeah Randy's intake gaskets were a little over the limit in thickness. It was fun sanding them down in the 9th hour (with Wesley Roberson over my shoulder) and bolting the intake on within a few seconds 'till disqualification. Randy's Pro-comps did well however his engine was really really low-buck and didn't deserve to score last that year. My Pro-Comps were heavily customized and the results were good. J.Rob

Posted By: Dunnuck Racing

Re: ProMaxx Performance 440 heads - 11/09/14 01:38 AM

Use extreme discernment when reading this article. J.Rob

Know something you can share? I can see I'm going to have to call you soon.
Keith

Posted By: RAMM

Re: ProMaxx Performance 440 heads - 11/09/14 03:53 AM

Quote:

Use extreme discernment when reading this article. J.Rob

Know something you can share? I can see I'm going to have to call you soon.
Keith

I welcome it. 613-931-2157 7-4 EST ask for Jesse

Posted By: 2boltmain

Re: ProMaxx Performance 440 heads - 11/09/14 04:02 PM

Why do most mfgrs of aluminum heads have the ends milled flat and polished? Is this to have a clear and readable logo?

Posted By: 69dart

Re: ProMaxx Performance 440 heads - 11/27/14 04:36 PM

Jegs has these heads ON SALE today.

JEGS

I may have to try a set at those prices!!!

Attached picture 8343405-Jegs.jpg

Posted By: 69dart

Re: ProMaxx Performance 440 heads - 11/27/14 06:25 PM

Does anyone know if the pushrod clearance is any better on these than the 440Source Heads? We had several hours of grinding to get the pushrods to clear on my 383.

Posted By: Skynyrd

Re: ProMaxx Performance 440 heads - 12/12/14 02:38 PM

Quote:

Does anyone know if the pushrod clearance is any better on these than the 440Source Heads? We had several hours of grinding to get the pushrods to clear on my 383.

Yep, several had to be filed. That was an unexpected deal. I don,t remember what size pushrods we used without looking on the build sheet . But we stuck with the largest size , was told to not go to the smaller one's.
I thought maybe we needed offset rockers but that may not be right.

Posted By: Anonymous

Re: ProMaxx Performance 440 heads - 12/12/14 04:34 PM

Making room for push rods is normal on any aftermarket head unless you use a 5/16ths--which with hyd cams is fine-- but most builds will require a 3/8ths pushrod--any Mopar requires lots of time spent--shimming each pair rockers--getting it just right--centered on valve as close as possible while clearing the head and all the while winding up with proper side clearence per pair on rockers--each pair may be shimmed different--that is Normal--grinding for more room is very normal operation an any build. Wait until you get smart and put 1.6 ratio rockers on with a big cam--Lots o grinding there!!
I have been dynoing plain old 440 street engines with Sidewinder heads--looks like with bigger hyd cams they are doing easy 530 range on simple flat top pump gas combos--these have been with STAMPED stock rockers as well.
Low you say?? I say cheap and simple and enough HP and monster TQ to rip quarter pannels off.
90% of customers have NEVER had any real HP and over 500 REAL HP makes them shake after a ride--as it SHOULD! The quest for all these 600-700HP street engines is a laugh to me--you can't hook it up--they are a PIA to drive with all that converter , gear etc--Street driving a race engine has never been as fun as it is rated--like driving the Zamboni on a skating rink.
Just my two cents worth--Call Todd at Marsh, get some Sidewinders and enjoy not paying the extra $600 for Edelbrocks and going same speed.
Same head everywhere no matter the name--buy a skid of them and you can name them anything you want--we are LUCKY to have a quality head that is less than the others out there--Source heads are brittle castings to me--these heads have the guides centered Right ON and are all CNC finished--I have been using them like popcorn and Todd at Marsh Performance has Kept them coming!!!!

Posted By: Thumperdart

Re: ProMaxx Performance 440 heads - 12/12/14 06:13 PM

Quote:

Making room for push rods is normal on any aftermarket head unless you use a 5/16ths--which with hyd cams is fine-- but most builds will require a 3/8ths pushrod--any Mopar requires lots of time spent--shimming each pair rockers--getting it just right--centered on valve as close as possible while clearing the head and all the while winding up with proper side clearence per pair on rockers--each pair may be shimmed different--that is Normal--grinding for more room is very normal operation an any build. Wait until you get smart and put 1.6 ratio rockers on with a big cam--Lots o grinding there!!
I have been dynoing plain old 440 street engines with Sidewinder heads--looks like with bigger hyd cams they are doing easy 530 range on simple flat top pump gas combos--these have been with STAMPED stock rockers as well.
Low you say?? I say cheap and simple and enough HP and monster TQ to rip quarter pannels off.
90% of customers have NEVER had any real HP and over 500 REAL HP makes them shake after a ride--as it SHOULD! The quest for all these 600-700HP street engines is a laugh to me--you can't hook it up--they are a PIA to drive with all that converter , gear etc--Street driving a race engine has never been as fun as it is rated--like driving the Zamboni on a skating rink.
Just my two cents worth--Call Todd at Marsh, get some Sidewinders and enjoy not paying the extra $600 for Edelbrocks and going same speed.
Same head everywhere no matter the name--buy a skid of them and you can name them anything you want--we are LUCKY to have a quality head that is less than the others out there--Source heads are brittle castings to me--these heads have the guides centered Right ON and are all CNC finished--I have been using them like popcorn and Todd at Marsh Performance has Kept them coming!!!!

Sound promising so far and I`m here to tell ya driving 600-700 hp engines has been the norm for me for MANY years w/out any draw backs to me and AGAIN more myths de-bunked. I have an 8" 5000+ vert, spool and yada yada.............some like it, some don`t........some can handle it and some can`t but what fun w/MORE to come.............

Posted By: Anonymous

Re: ProMaxx Performance 440 heads - 12/12/14 08:32 PM

Man I must be getting old...
No..wait a minute, I just built a vintage Front Engine Dragster...oh wait, now I am old and Crazy!!
I just got tired of dodging the deer and the cops on the street and now with all the texters driving , I am WAY safer at the track.
You go Thumperdart! I admire you!!!!!!!!!!!

Posted By: Thumperdart

Re: ProMaxx Performance 440 heads - 12/12/14 08:43 PM

Nothing to admire here and I`ve slowed down a bit on the street these dayz but years ago, lord have mercy and I have no clue how I even survived this long.............

Posted By: Stevenisme

Re: ProMaxx Performance 440 heads - 01/07/15 05:41 PM

What I woul like to say is Promaxx 440 head and Todd Sidewinder head are very nice casting and accurate machining. The material is A356.2, elements such as Fe, Ti, Mg, and Si was under control. Which help the aluminum have better microstructure and lead to better physical performance such as hardness, elongation. The advantage of the casting is the intake and exhauste port are very smooth. Much smoother than RPM heads. Because the casting is using special fine sands in intake and exhaust port. The machining is using modern technology with 4 axises CNC machines. The combustion volume, the position tolerance was under strict control. The machine tolerance is 3/1000 mm. There is someone do it better, it's AFR. AFR tolerance is 1/1000 mm in key positions. In a words, the heads were made by OE standards with is same as GM present cylinder heads production standard. Both Promaxx and Todd is doing great job to make the better 440 cylinder head better. More people try it, more people will be happy.

Posted By: Dunnuck Racing

Re: ProMaxx Performance 440 heads - 01/07/15 07:03 PM

Steven, I just, saw your email and responded. Thank you for helping us all out with quality products.
Keith

Posted By: BradH

Re: ProMaxx Performance 440 heads - 01/07/15 07:29 PM

Quote:

... The quest for all these 600-700HP street engines is a laugh to me--you can't hook it up--they are a PIA to drive with all that converter , gear etc--Street driving a race engine has never been as fun as it is rated--like driving the Zamboni on a skating rink.

Well, my car drove pretty much the same on the street when it ran 10.5s as it did when it ran 12.0s. Not just my opinion, but that of a friend of mine who has seen the car evolve over most of the last 20 years I've owned it.

I don't race on the street, but if I wanted it to hook on the street(

), I'd take a different approach than what I've done to date.

You may now return to your regulary scheduled program about these new budget heads.

Posted By: Anonymous

Re: ProMaxx Performance 440 heads - 01/07/15 11:04 PM

Quote:

Quote:

... The quest for all these 600-700HP street engines is a laugh to me--you can't hook it up--they are a PIA to drive with all that converter , gear etc--Street driving a race engine has never been as fun as it is rated--like driving the Zamboni on a skating rink.

Well, my car drove pretty much the same on the street when it ran 10.5s as it did when it ran 12.0s. Not just my opinion, but that of a friend of mine who has seen the car evolve over most of the last 20 years I've owned it.

I don't race on the street, but if I wanted it to hook on the street( ), I'd take a different approach than what I've done to date.

You may now return to your regulary scheduled program about these new budget heads.

I should have said Most not all
Sure there are guys that have evolved a car/combo over the years and it is what hot rodding is all about--That is a thing of beauty and to be admired

I just see so many combos that are not that well organized or sorted and are really just race car set ups on street car paint jobs and thus my statement--BTW I built a few of the unruly type when I started--
These days FI etc has sure made things better and all the big CI with mild cam and 3.23 rear gears --sweet new converter science--all adds up to some magnificent street machines that will run as well as our race cars did 20 years ago
again....

On the street I prefer my Hemi Ram pick up and on the track I am LOVING my Front engine dragster--Both do what is asked of them really well
After a pass in the dragster you KNOW you were in a race car that was stinking fast--and the truck has comfortable room for all the junk I carry around with me and a big console storage

Posted By: Stevenisme

Re: ProMaxx Performance 440 heads - 01/08/15 01:05 PM

A young guy who involved in OE engine parts for 7 years, sold his building, rent a apartment, live with his wife and 2 years old baby. The money was invested in casting and CNC machines which is same as the former OE factory. The quality is this young guy's face and future. They have no sense of how to make cheap aftermarket heads. Such as T6 heat treatment could be 5 hours or 3 hours, the hardness could be same, it was not what casting standard told me, it was a aftermarket casting guy told me. I don't think Promaxx or Sidewinder heads need to shoot at Stealth head. Stealth head was casting from one factory, machining by another factory. I know these two factory people since 2010. If you put Promaxx or Sidewinder head with Stealth head, you will make the decision in a half second. The Mopar heads need some fresh blood to let people know the heads could be better done.

Quote:

We recently did a maxed out full port on the Sidewinders ( same head I believe) and the results were right at 313 CFM intake on a Very correct , calibrated, stingy bench.
I am sure as time rolls on and more heads are whittled on that it will get better but honest, this is a street strip head not intended to go toe to toe with Victors, Indys etc
It is designed to be an Edelbrock killer and I guess you need a "Sidewinder" to shoot at Stealths?
So far---I have done several strong street engines with these heads --ZERO issues--I love the casting quality and the seats and guides are some of the best on the market --ports are more equal on these than other brands as well.
We have a regular old 440 flat top headed to the dyno soon with a set and a hyd cam so will report.
I love the quality for the $$ and feel like they are the best answer out there for a street/strip big block--way less than Edelbrocks and IMO better overall quality than everything else.
Want to race hard and go really fast? Sure, there are better choices but these heads will do anything an Edelbrock Performer head can for LESS $$ and at 313 CFM--Surprise many a bracket racer!!
Now...spending the loot it takes to get 313 CFM range--on a street head? Well... that is up to the individual, and a real race head may be better choice but...the heads are VERY capable of some Serious HP!
So far....I LOVE these heads!

Posted By: dogdays

Re: ProMaxx Performance 440 heads - 01/08/15 06:03 PM

So now that we're talking to someone much closer to the manufacturer, here's the question I've been dying to ask:
Could you build a head with a modern combustion chamber? Look at the AFR smallblock chevy heads for inspiration. Or basically any other modern aftermarket Wedge head.

Thanks,
R.

Posted By: DGS

Re: ProMaxx Performance 440 heads - 01/12/15 10:16 AM

Quote:

So now that we're talking to someone much closer to the manufacturer, here's the question I've been dying to ask:
Could you build a head with a modern combustion chamber? Look at the AFR smallblock chevy heads for inspiration. Or basically any other modern aftermarket Wedge head.

Thanks,
R.

The discussion always seems to stop when the topic gets to the old chamber design..

Posted By: Anonymous

Re: ProMaxx Performance 440 heads - 01/12/15 03:31 PM

Those chambers usually come in at 75CC range or less I am sure as an aftermarket maker they have to decide--will these heads work with all the pistons and combos out there already--I think that is the consideration--OK you get the small chamber and now everyone will start needing dish pistons for the street stroker combos--it will be a challenge of sorts to get correct CR for street--Do you really think that chamber is going to add anything more than a tenth or so? It sure won't be a five car length deal in most cases now will it? The Sidewinders are an EASY to use head that is high quality and cheap--better quality by FAR than the previous low price leader--I say again--BY FAR! It works super easy with shelf stock ( read less expensive) pistons and is like an Edelbrock in terms of power making ability ( if not better) so I love them. If I want a race head well..I can deal with Indy--wait....I would rather go slower. BTW just got a set of new SR indys--the deck was cut with three passes using a narrow cutter---now who in the world thinks that is a good idea?-deck had at least a two thou "step" at each of these lines--and the valve job had so much chatter in it--looked like the cutter used was from 2006 so....after spending time and $$ to clean that mess up I am even more convinced that these Sidewinders are good enough for the large percentage of my builds
These heads are a good thing--I could care less about a closed chamber version--that is not what they are aimed at.

Posted By: Dunnuck Racing

Re: ProMaxx Performance 440 heads - 01/12/15 04:55 PM

As Crabman stated, small chamber heads can be a whole issue in itself.
A flat top 440 with zero deck pistons and valve reliefs will come in about 10.2 to 1.
Get creative and you can get around 11 to 1 with an 84 cc chamber. At that static compression ratio you need a pretty large camshaft to stay away from detonating on pump gas.
Sure a more refined chamber shape will help a little but having good quench takes care of most of what a good chamber design will gain you.
Several of us are building really nice engines that make more power than most guys can apply without going to a more expensive head. That's what these are meant for
Keith

Posted By: 67Satty

Re: ProMaxx Performance 440 heads - 01/12/15 07:40 PM

Crabman and Dunnuck, I know each engine could be different, but in general, what is the pushrod clearance like with these heads and 3/8" pushrods and 1.5 rockers? Have you had to grind for clearance or not had to grind for clearance in most cases? Thanks!

Posted By: Stevenisme

Re: ProMaxx Performance 440 heads - 01/25/15 04:22 PM

Quote:

Crabman and Dunnuck, I know each engine could be different, but in general, what is the pushrod clearance like with these heads and 3/8" pushrods and 1.5 rockers? Have you had to grind for clearance or not had to grind for clearance in most cases? Thanks!

I did not hear anything about the clearance. If there is before, there is not afterwards.

Posted By: 69dart

Re: ProMaxx Performance 440 heads - 03/26/15 03:06 AM

Used one of the summit coupons and picked up a set of the promaxx heads for like $957. Can't beat that deal. I'm going to put them on my new 383 and see if I can get the roadster to run 5.90s.

Posted By: Anonymous

Re: ProMaxx Performance 440 heads - 03/26/15 03:34 AM

I have done three engines with 3/8ths pushrods so far--no grinding needed BUT--I did take my time and shim each pair around like you always have to do on Mopars--these were all rollers as well
Maybe you need a touch here and there--it would be a big plus to have just a tad more room then it would be for sure but I think any engine builder that knows his way around a Mop will have almost no trouble with 3/8ths--

Posted By: 69dart

Re: ProMaxx Performance 440 heads - 03/29/15 05:31 PM

Sounds good. I'm still waiting for the UPS guy to drop them off

.

I'm curious of how much shim is typically needed?

I finally tested the shims on my current setup and the .030 shim got it centered. Fingers crossed this and solid spacer rather than springs cures my broken rocker issues.

Posted By: Silver70

Re: ProMaxx Performance 440 heads - 03/30/15 05:55 PM

I got mine like 69dart from summit with a code. Says estimated ship date is 4/20. I didn't even realize summit carried them when I was looking to see what heads they offered last week. For now going on a 383 with 2293 pistons with an unknown solid cam size. Ran 12.0s 25 years ago, hope for some 11s now

Posted By: Anonymous

Re: ProMaxx Performance 440 heads - 03/31/15 01:10 AM

Quote:

Quote:

Crabman and Dunnuck, I know each engine could be different, but in general, what is the pushrod clearance like with these heads and 3/8" pushrods and 1.5 rockers? Have you had to grind for clearance or not had to grind for clearance in most cases? Thanks!

I did not hear anything about the clearance. If there is before, there is not afterwards.

Steve I am doing one later this week on a 440 with 3/8ths pushrods and a .575 solid roller with Harland Sharp 1.5 ratio rocker arms I will let you know how it works out

Posted By: Streetwize

Re: ProMaxx Performance 440 heads - 03/31/15 10:54 PM

@Crabman,

David,

Is the set you're talking about the set that Larry Smith ported for Todd (Sasquatch?) Or was that a Small block Procomp set, I can't remember.

Not trying to Threadjack, I know Todd's doing a lot of cool things with the Sidewinders

Posted By: Anonymous

Re: ProMaxx Performance 440 heads - 04/01/15 02:06 AM

We have been usingthem like popcorn--so far have done everything from swap them on a 440 with 509 hyd--wowzer--out of the box stamped rockers GREAT engine---- to some port work , 440 ,big hyd cam and an EASY 569HP first pull--full ported are showing better and better numbers as Larry zeros in on them--I have a set on a 511 right now that I just cleaned up on my back yard bench--street solid roller --will report as it moves along--not pulling every angle just tossing it together and see what happens--
So far with 1.5 PRW rockers and 3/8ths push rods I had them all clear on a street hyd roller unit--have Harlands on this 511 so we'll see soon as Smith gets the tubes here

Posted By: 69dart

Re: ProMaxx Performance 440 heads - 04/09/15 11:50 PM

Heads were delivered today.

Pluses
They look really nice... a very nice finished look
Bowls and exhaust ports look perfect
Very little cleanup left to do OOTB

Minuses
Need a little cleanup to match the intake ports
Stamped locks so those will have to go
Doesnt look like any of the holes are helicoiled so hopefully that wont be an issue

I've ran 906's, Edelbrocks and 440 Source Stealth so far and would say the new ProMaxx Heads look very promising at an unbelievable price point.

Once I get the intakes port matched and clearance the pushrod holes a bit for good measure I'll get to my engine builder to see what he thinks.

I see 5.90's in my future

Posted By: Anonymous

Re: ProMaxx Performance 440 heads - 04/10/15 02:22 AM

3/8ths pushrods cleared with PRW stainless rockers--They will NOT clear with Harland Sharp 1.5's I worked and worked but was afraid of boring through an intake wall or worse so I quit and ordered Smith Bros 5/16ths pushrods for this 511 Smith says good for 700 open I got 460 range so am not worried about that part
They clear ok at the bottom but up near the top it was trouble
The Smith Brothers 5/16ths are my go to for this issue on street engine now--Geeez!
I am getting too old for this I need a career change
Steven in China Listen up!

Posted By: Azzkikrcuda

Re: ProMaxx Performance 440 heads - 04/10/15 02:58 AM

I have been using the thick 5/16 from Smith Brothers on a few street engines. They work great, and I don't have to mess with clearancing the head.

Posted By: Anonymous

Re: ProMaxx Performance 440 heads - 04/10/15 03:09 AM

I actually sent for the .080 wall as they assured me they were stout enough they also had the .120 wall but -----he said they might make me sleep better but that at my 9 inch length the 080 was rated at near 700 open--I figured they knew and so... They do look like the future as far as I am concerned

Posted By: 70Dustmite440

Re: ProMaxx Performance 440 heads - 04/10/15 06:12 PM

crabman173 is over their Private Message Limit.... just saying

Posted By: 69dart

Re: ProMaxx Performance 440 heads - 07/19/15 02:28 AM

Okay - so I dropped a valve on my 440 source heads. So the ProMaxx heads will get a back to back comparison.

I did clean up all the ports and have the springs, retainers and locks swapped for titanium roller cam stuff.

So far I've been impressed everything has fit. The 3/8's pushrods did require substantial clearancing to fit the lowdeck with my mopar 1.6 rockers but everything else has been good.

Sounds nasty in the driveway so we'll see how she runs tomorrow. Hopefully it'll run 5.90's since it went 6.teens with untouched 440 source heads.

Honestly as long it lives the rest of the season I'll be HAPPY!!!

Posted By: Anonymous

Re: ProMaxx Performance 440 heads - 07/19/15 12:35 PM

1.6 ratio is always a PIA on any Mopar head
The Sidewinders are a bit fatter at the top of the intake port--I have had to do more on them than other heads
You will like them!

Posted By: 69dart

Re: ProMaxx Performance 440 heads - 07/20/15 12:54 AM

Well the weather was horrendous today. In the 90's with 76 dew point so I'm not sure how good of a back to back it was. The car ran exactly the same as it did the last time out.

I think I'm going to add some timing and maybe fatten up a jet or too as it did seem a bit lean on the big end with. I set the timing at conservative 34.

Most guys were a tenth or so slow and we ran the same so they 'might be better'.

I'm just thrilled its put away in one piece and ready for the Mopar Nats

Posted By: Cab_Burge

Re: ProMaxx Performance 440 heads - 08/07/15 03:04 AM

any updates on your car with the newheads? Also, who did you buy yours from and where they complete and ready to bolt on? Thanks, Cab

Posted By: 69dart

Re: ProMaxx Performance 440 heads - 04/29/16 03:11 AM

Update: The roadster has gone 5.98 @ 114 in the 1/8 and 9.63 @ 134 since replacing the heads.

I have to admin I'm pretty happy getting a 5.98 from a TRW piston 383 with a torker intake and 750 E85 carb. The car is just plain nasty with this combination. I couldnt be happier with these heads.

Posted By: Thumperdart

Re: ProMaxx Performance 440 heads - 04/29/16 03:31 AM

Originally Posted By 69dart

Congrats man.............

Posted By: cudadoug

Re: ProMaxx Performance 440 heads - 07/06/16 10:59 PM

Let's dust this off shall we? I see the Promaxx head at Jegs for a very attractive price point. I search for Sidewinder heads and all I see references to this and other discussion boards.

Where does one procure these Sidewinder heads that you speak of?

Has any ONE bench flowed all of the new heads out there:

ProMaxx
Sidewinder
Eddys
440 source

Also...what head is CPPA/Toth plagiarizing?? Looks like all of the others in pics.

Carry on...

Posted By: an8sec70cuda

Re: ProMaxx Performance 440 heads - 07/06/16 11:01 PM

Todd Marsh at Marsh Performance http://www.mopartsracing.com/

Posted By: cudadoug

Re: ProMaxx Performance 440 heads - 07/07/16 12:21 AM

Originally Posted By an8sec70cuda

Todd Marsh at Marsh Performance http://www.mopartsracing.com/

BOOM! That's what I was looking for. Thank you, sir!

Posted By: krautrock

Re: ProMaxx Performance 440 heads - 07/07/16 02:10 AM

i've been looking around trying to figure out how close the sidewinders (and i think therefore, the promaxx) are to the edelbrock heads. they seem pretty close. stealths flow a little less than sidewinders. i haven't really figured out if the edelbrocks flow more than the sidewinders but i imagine it won't be a large amount...

gotta give a thanks to dwayne for posting flow numbers (all over the place, and in the tech forums) and also giving me the lowdown on configurations of the sidewinders and stealths.

i'm not buying parts yet but i think some sidewinder type heads will be enough for a hot street motor i want to put in my coronet. save some money on the heads and put that towards rear suspension stuff or a nice converter...

Posted By: killermopar

Re: ProMaxx Performance 440 heads - 07/07/16 02:19 AM

Competition products has the promaxx ones too.

Posted By: krautrock

Re: ProMaxx Performance 440 heads - 11/08/16 10:32 PM

bumpin this up, Jeg's has the 240cc port Promaxx heads now.
a few different valve spring configurations. 2.19/1.81 valves.

no pics or flow charts for them though, the pic in the listing is the regular promaxx BBM head...

http://www.jegs.com/p/ProMaxx-Performanc...947797/10002/-1

Posted By: fast68plymouth

Re: ProMaxx Performance 440 heads - 11/08/16 10:40 PM

I guess at this point the question is, is it a different head, or a CNC ported version of the std head?

Edit:
I just checked the link.
Looks like it's a CNC ported version of the std head.

Posted By: GomangoCuda

Re: ProMaxx Performance 440 heads - 11/09/16 12:05 AM

How soon will we know how they compare to Trickflows?

Posted By: BradH

Re: ProMaxx Performance 440 heads - 11/09/16 02:51 AM

Originally Posted By GomangoCuda

How soon will we know how they compare to Trickflows?

I'll take a w.a.g. and say you can use the published data for the MCH CNC-ported Stealth or Edelbrock Performer RPM for comparison.

Posted By: fast68plymouth

Re: ProMaxx Performance 440 heads - 11/09/16 05:51 PM

The MCH CNC rpm/stealth porting program is more like 251cc, so if these are 11cc less.... One might "assume" they would flow a little less.

Posted By: BradH

Re: ProMaxx Performance 440 heads - 11/09/16 08:55 PM

That's why I said w.a.g. instead of s.w.a.g.

Posted By: killermopar

Re: ProMaxx Performance 440 heads - 11/09/16 10:57 PM

Would the CNC version make sense on a low deck, Street, 512 build?

Posted By: krautrock

Re: ProMaxx Performance 440 heads - 11/17/16 05:16 PM

I would think these heads would work nicely for stroker street motor.

I'm going to (eventually) build a 451 low deck since I picked up a 440 crank that has already been machined for the application. Tempted to run the trick flow heads because of the combustion chamber but honestly, I would probably be happy (aka, make plenty of power) with the unported Promaxx heads too.

anyways...

got an email back from Promaxx. I asked about their hydraulic spring application...

Lift intake exhaust
.200 157 108
.300 224 152
.400 275 184
.500 305 208
.600 318 227
.700 323 239
.800 327 247

The specs of the head stays the same, so the combustion chamber would stay at 84cc's. The manufacturer of the springs for this application is Pioneer.

Posted By: fast68plymouth

Re: ProMaxx Performance 440 heads - 11/17/16 05:29 PM

If they flowed that on my bench they would be better than the TF heads.

I for one don't think that would be the case........ But "ya never know".

Posted By: krautrock

Re: ProMaxx Performance 440 heads - 12/06/17 06:23 PM

i just found these pics of the promaxx CNC ported heads. the price for these heads bare is pretty high, jegs has them complete for 1700 i think. I would wonder if all the CNC heads have the chamber done like on this listing.
at 90cc in the chamber that might be a good option for someone trying to keep compression down some.

there are small block heads listed too.

promaxx BB

promaxx SB

Posted By: fast68plymouth

Re: ProMaxx Performance 440 heads - 12/06/17 06:44 PM

The assembled heads are more money than the TF 240's...... And they're Chinese castings.

IMO, TF pretty much has that market covered as long as they keep the prices similar to what they are now.

ProMaxx Performance 440 heads