@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

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

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

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!

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.

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

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

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!!!

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!

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

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

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.

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

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...

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

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

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...

Competition products has the promaxx ones too.

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