Hey guys, I wanted to know if anyone here has done any independent flow testing on the Promaxx 9440 heads ? By all accounts they look like an imported copy of the RPM's. But, they claim to flow 145@.200 206@.300 256@.400 278@.500 294@.600 298@.700 intake valve lift. Impressive numbers for an entry level head. All additional research I've read about them has been promising and if they flow as they claim.. seem like a great value. Any further input or experience you guys could share about these particular heads would be much appreciated. Thanks.

i've been eyeing those heads for a while, they should be plenty for a hot street motor. could gasket match them and spend some time evening out the pushrod pinch for all the ports and maybe get a little more.
they use pioneer springs.

there was a thread on the small block heads and they are nice.

see thread.
https://board.moparts.org/ubbthreads/ubbt...ad-testing.html

if promaxx has the small block head flow numbers posted, you could compare them to what pittsburg racer got. the numbers weren't posted when that thread originally was active...

actually, i was curious..

the small block flow numbers posted by them.

https://promaxxperformance.com/product/maxx-171-sb-mopar/

Yeah, by their numbers it looks like those could support a 500 hp small block pretty easily. I've heard good stuff about the BB heads too, just curious if anyone had done any independent testing of their own ?

294@.600, 298@.700 seems a little lofty to me....... but I wouldn’t call it “impossible”.

I can see the lower lift numbers being pretty close though.

Thanks Fast68, I was hoping you would chime in. Have you had any experience with any promaxx heads of any style? BBC,SBC,etc.. ? Or know of anyone with experience running them ?

No experience with them....... sorry.

But I have no doubt they would work just fine if that’s the type of head you’re looking for.

If anyone local has a set of big block ProMax heads and wants them flowtested I will flow them for free. Freeport, pa. 16229.

Wow, thanks for offering that Pittsburghracer.. super cool👍.. I read the whole thread about your experience with the small block heads.You sounded impressed. Judging by what they list on their website vs what your bench flowed, their numbers seem pretty accurate. The big block heads look like a great option for a street/strip build mine. They're also about $400 less than the Eddies. How did the valves look on the small block heads ?

I only pulled one intake and one exhaust valve to flow the head for a young Friend. Thy looked like nice valves and Steven at ProMaxx told me they were valves picked by ProMaxx. I wanted to help my Friend strip BOTH heads (he could use my shop and tools) but he wasn't interested. I didn't make or want a cent for my labor but I wasn't about to strip both heads for him while he sat there. LOL

you can use that jeg's code right now (see the banner at the top of their homepage) and get $100 off the heads. so, roughly $975 for a complete set of heads.

What's the difference between what ProMaxx sells and Sidewinder heads (LINK), besides who picks the associated parts and who does the prep work?

From the Sidewinder guy himself....Nothing but what you stated.
Todd

FWIW, you'd get my vote & $ (but it ain't my post )

Hello Todd, I didn't see that you offered the larger valved cnc version of that same head. Does anyone have any supporting data on those?

One thing about the parts on the assembled heads that make me nervous is.......the price.

For $137 over the cost of bare heads($1553/pr), you get springs, retainers, locks, seals, spring cups, and stainless valves($1690/pr).

I think the only way the promaxx heads make sense is if you are going to run them basically stock. the CNC version is too close to the cost of the TrickFlow heads...which most likely come with better hardware like Dwayne just pointed out.

So, you can find the TF heads on ebay from places with free shipping. watch for one of those %10 discount codes and save $100 per head (sold individually).. (use two different ebay accounts...)

You'd have to have 2 different paypal accounts too... that used to work, but not anymore.

I offer them with pretty much what ever each individual wants on their heads. We port them, and use the springs, retainers and hardware that YOU want. Every set is built to the customers specs so they only pay for what they want and need. We use Comp cams, Manley and other parts to make your hamburger the way you want it. No Cheap parts no short cuts. I have no need for a CNC I have Larry Smith on the payroll.
Todd

Agree. Bang for the buck the Trick Flow heads look be the much better value for very little extra money. And they are proven perfomers from a company with a very good reputation.
Cant wait to get a set for smallblock. Wouldnt even remotely consider these