Ive been looking at ebay heads for about a month.
Victors seem to be a little big and very pricey.
Speedmaster 190cc heads would be perfect but Ive read quality is sketchy.
After reading the below thread It appears the promaxx heads are about perfect for my application BUT the exhaust flow #'s leave me feeling congested. (pun intended)

board.moparts.org/ubbthreads/ubbthreads.php/topics/2114443/1.html

What does bell shape mean when increasing exhaust flow?
Can I do this myself?

Widen the floor?
Widen the runner?
Raise the roof?
Deshroud chamber?
Radius valve head?

Would those easy procedures do the trick or is it something more complex.

This just about maxx's out my budget.
http://www.jegs.com/i/ProMaxx-Performance/723/9360/10002/-1

So far for the bottom end Ive got diamond dish pistons, eagle rods, TS 1/16 rings, main studs, Comp blower cam with .512 lift/114lsa and may get a girdle.

https://www.ebay.com/itm/371660576728
$179

Ill also have to buy rockers and maybe pushrods but that's it.

Why not look at the edelbrock rpm heads the cost is the same as the over sea heads

Appears the ProMaxx 9360's are $200 less and according to Pittsburghracer they flow 20cfm more.

I guess I could go with the EQ Iron heads but they are like $500 ea, heavy, and I'd have to do lots of porting I assume to match the ProMaxx heads.

I'm lost on all this but have $1400 burning a hole in my pocket.
LOL

My chinese knockoff mag iron heads, the intake holes are way higher than normal EQ heads. Might also be porosity issues (blowing combustion into the cooling system) tho in fairness that might be my head gasket fiasco (ain't got to the bottom of it yet). they were supposed to be legit EQ heads & I would put his dealer name out there but the last time I did it got deleted.

The ProMaxx heads jumped "way up" in price since my Friend bought them for 1050.00 I would have to think twice about buying them now but we are set pretty good with lots of Edelbrock heads. LOL. They do offer CNC'd heads now too. (ProMaxx)

So being $300 more than a couple years ago they are not worth that?
You've played with many of these heads. Which do you think would be best run close to ootb?

I have a set of factory magnums in hand but they would need the full workup and I'm not sure I have a week to spare.
And really no way to verify what I've done is legit except for track mph.
This is about all the time I had to work on the project this weekend because of POTTY time/baby sitting.

I personally would not run ant head out of the box but its nice being able to do your own work. An Edelbrock head out of the box is now a piece of CRAP!!!!!!!!! After checking out the ProMaxx heads I'm betting I could have a set ready to both on in under 2 hours time checking things over, (guides, valve job, spring pressure< ect) I didn't check every guide or spring pressures for my Friend as it was a quick, fast FREE-be. Quality and flow numbers were both better than the new set of Edelbrock heads I have sitting here for a project of mine.

I've been searching but cannot find promaxx heads for sbm that are cnc'd.
Only the 190cc procomps which cost $600+ more than the standard 171cc heads.

Got a link?

It's insane how cheap these BB mopar heads are at 210cc's.

http://www.ebay.com/itm/Mopar-Chrysler-B...d-/291722416620

And even these @265cc's. Dang.

http://www.ebay.com/itm/Renegade-11983B-...r-/281836875265

I guess they aren't any good if your not a machinist though.
Hmmmmm

Makes me want to ditch the sb and stuff my forged 440 crank into my 400 block.

I gotta finish this task though so after tuning and having some fun I can give the sb to my 14yo son.

Uugh.

I'm about to add these dad gum things to my cart and hope for the best.

http://www.jegs.com/i/ProMaxx-Performance/723/93605/10002/-1

I have had some personal PM's and emails because of my post and some have been in touch with Jason at ProMaxx. If they want to step into the conversation they can provide more info. This is a part of one of the PM's.


""We have multiple spring options. Cnc heads are 185cc runner looking at $1400 loaded for as cast, and $1900 loaded for cnc ported.


I also have flow charts but like I said they were from private PM's so I don't feel at ease posting them. If in dought call and ask for Jason at ProMaxx. They are kinda out of my price range right now and my next purchase will probably be a set of W7's for an R block I bought and a set of the new Victor heads.

Here's a link to my old post.

https://board.moparts.org/ubbthreads/ubbthreads.php/topics/2113121/1.html

Flow charts and CFM don't mean the same with boost.

,,

Why is that?
It would seem to just amplify the efficiency.
I would also assume that slightly bigger and lazier port wouldnt effect low end as much with artificial velocity.

I want to call Promaxx tomorrow and see if they would cnc the exhaust only.

STOCK Ls1 heads flow 238/203 @600. with 205cc port volume.

http://www.hotrod.com/articles/hrdp-1012-ultimate-chevrolet-ls-cylinder-head-test/

Works pretty good under boost.
1000+ HP to the tires.

Bone stock heads, rods, pistons etc.



Me thinks the 190cc Speedmasters or 185cc ProMaxx may not be too big for a 367cu mopar with blower.

For a turbo car, I would look at getting bare heads and having a head specialist install seats and valve that can handle the higher temperatures the turbo cars generate. Might also want to plumb a cooling line between the center exhaust ports.

Still dreaming and searching>

Hmmmmmmm
Anyone have flow #'s for these?

So your saying for a turbo application that these may be better?
Stronger and more reliable.

Jason at Promaxx emailed me the two flow charts on the Mopar SB heads. Here they are for reference.

More boost will make up for poor head flow... but it doesn't mean more headflow won't make more power. As an example I went 10.08@136 on home ported iron heads at 20psi. I've been 9.80's@136mph on 17~18psi with CNC ported Eddy's with basically the same combo. A bit of that ET is 60ft, but you can see that it took less boost to go the same MPH.

Reading through this thread, I don't see anywhere that you've stated what your goals are for this project. I assume by your screenname that you're going procharged? If so how big of a blower, and how big is the motor it's going on?

If you're looking for budget 600hp, you don't need a whole lot of head. If you want 2000hp that's a different story.

General rule of thumb #1, If the blower is big enough, and you have enough fuel octane to run some decent boost... you can definitely err on the small side with the head and get away with it.

General rule of thumb #2, If the blower/turbo is small... or you're fuel quality limited... it would be wise to get as much out of the motor as you can N/A with your head choice.

Very much appreciated for those flow files.
Thankyou.

My lust for flow says buy the 185's.
My wallet says to buy the 171's.

I do not see the ported versions online for sale from someplace like Jegs or Ebay as my paypal credit could easily change my mind.

I can't seem to find ProMaxx website.
What is their phone #?