I had a small block Ford with ProMaxx heads. Having taken them to ProMaxx and being allowed to watch them do a spring upgrade and seeing the care they put into assembling the heads with quality parts is impressive.
Great Video, I run the Promaxx 317’s on my 498 BBC with an 8-71 Supercharger. Gotta say these heads Are A Very Nice Piece and make Great Power, wasn’t mentioned in the video but these are Chinese Castings that are Professionally Assembled in The US by some Really Knowledgeable Guys, I’ve Spoke with them on a few occasions and couldn’t be more happy with their customer service and advice.
My son has a set of their "Maxx 200" sbc heads on his 383ci sbc and that thing rip's! He's had them on there 3 or 4yrs at this point, no problem's whatsoever. Castings looked great, no flash anywhere, nice and clean, I say good heads!
Still hoping for a budget true oval 260-270 head for us street BBC guys. If it's Chinesium, so be it. We just want a lighter aluminum head to replace our 049/781 boat anchors. We just need something that performs about the same as a mildly ported GM iron head minus the weight. Most of us street guys don't spin our engines past 6000 anyway so the bigger 7500+ capable heads are more than we need. The Brodix Race Rites and AFR 265's are awesome heads but, not easy on the wallet for guys with kids and a mortgage. 😁
Eric built me a set of ProMazx 317's for my 496. .687/678 lunati HR, 248/254 11.2:1, dual plane, 850 carb, HEI, 2" Hookers, TH400 2800 stall, 250 NOS, 3.55 9", 87' Monte street car. I would buy them again.
Pretty good results and honestly that 625 lbs and 685hp and i think that's pretty good for a 496 and i get it a lot of people made more power on a bbc and all that but really with just lower buck heads and nothing top of the line what i think it's making good power. Amd if people say oh that sucks then bave them build there own big block and see how much hp there making. But keep up the good work
@@ryangulley2051 What was the point of your comment other than to let the world know that you those heads and a turbo? How did it in any way relate to what Chevy RC posted? So you have those 357's, good for you - cute little head. I run SR20's ported by Morgan on a 583, so, I'm cooler than you.
Unless they adjust the corrections or use the switch on some Superflow dynos that cranks up the output numbers. If you see a dyno printout, pay attention to volumetric efficiency, fuel flow info, and atmospheric conditions.
Been running ProMaxx on my 390 BBF bored/stroked to 445CI. They are a pefect street head for the money. Honestly, i had edelbrock performer heads on the same car and these seem to be a better head. The heads are built and ported in the USA Even though they are casted in china.
Man I need to get my money to get some of those Promaxx for my sbf. I’ve been interested in primes heads for years back when I had my square body. That was 10 years ago, and those heads were dirt cheap! Like cast iron cheap. Still at a reasonable price for todays standards.
Interesting thanks luv the videos! Seems traditional valve angle BBCs like the larger intake valve. Perhaps as the port gets straighter (9° vs 26/24°) the coefficient of discharge matters more?
@@musclebone7875 Vizard has some good stuff for the more conventional builds. Agree with how he tends to use a tighter lobe separation with less duration (but similar overlap) on most builds. Think as you get into more modern race heads someone like Darin Morgan is a good source
It's interesting for sure. The valve size and compression ratio difference should account for more then a 20 horsepower difference though. So something Is right with the enforcer head. 2.30 valve. And shave .003 off the heads should bring you to about 118cc for the AFR would be really interesting to see on that motor run again. If they truly were equil and no valve float issue where these engines would end up
The afr are not even close. Their port design sucks. To get the same chamber size you would have to mill off .018 on the enforcer to get to 119cc. Besides the horsepower the torque sucked too. It was the worst off all of the heads tested.
How much difference in horsepower and torque do you think the small amount of compression ratio between the two heads being 119 and 123 could make you think that could make up a 10 horsepower difference then it's a little bit more comparable but the flow on the exhaust of those pro Max is outstanding
I’m building. 496 with the longer rods and weisco pistons using the cam that comes in the 620 hp 572 crate engine been looking at the Skip White Bravo oval ports curious as to your thoughts on those
Do the enforcer bbc heads have smaller v stems like the sbc? seems they would wind up higher w/ lighter valves and same spring pressure hp and trq aside...yes?
Hey Eric, what sort of torque and power do you think the afr heads would be making on 540 cube big block, with a lunati custom Hyd roller .646/.663 Lift 250/255 Duration @ .050 114LSA do you think the standard spring pressure wld be up for the task? If not what springs should I go? Currently building this combo and am a day away from bolting on the heads!
@@OGAussieBirdman it's gonna make more than enough power to put a big ol smile on ur face. At 1.25-1.3hp/cube which is fairly achievable that's 675-700ish hp. A pretty good effort on pump gas na could be closer to 1.6hp/cube with conventional valve angle head but that's not common, more on E85... 540 cubes with conventional heads would probably like something around 106 LCA NA, on pump gas type compression. Duration I'd consider via overlap depending on other parts and what you're doing (like rpm...) What's the rest of your build? Advertised duration (would guess an efi cam like 309/314, 114/112?), intake, what head, carb, headers, compression?
I've run a LOT of hybrid (solid pressure fed lifter usually morel) hyd roller combo on street for 10s of thousands of miles at 0 lash cold.... You HAVE to run up near the non billet cam core max over the nose pressures to get the benefits, if you don't run enough spring it will nose over exactly where the hyd lifter usually gives up around, drum roll 6200-6300 no matter how big your cam and ive done it with AFR 305cc among others....to 7500 on a 468ci and even boosted..... Get close to what the core can handle, get a high quality ( ive even used the dissimilar metal bushing type like EZ rolls ) with direct pressure fed oiling ( made a huge difference in true street durability), and the induction/cam timing events are your limitation....assuming good geometry.... Not solid roller pressures just under...the last combo I had a hyd roller profile ground on a billet core with an F1A-94 blower and the sky was the limit on rpm or power....lasted years and still running to next guy ( that had a brodix head on it)... Man with that low lift cam been nice to see it with 25-30 more lbs and lighter valve train...ive even changed rockers and moved rpm to peak...I fought this for 20 years..I got some high dollar hyd rollers to 6500rpm BUT its gonna tick cold or tick hot....my setup at a light zero pure cold lash was SO silent you can't even imagine it...
Weiand really missed the Boat with the "Track Warrior" Weiand should have designed the Track Warrior with exacting flange parameters to their Team G and raised the ports at the plenum. Works okay but went back to my extensively ported Team G. I'd like to see the BBC RHS Manifold sometime in the future.
@@WeingartnerRacing are you sure I called pro max and got no answers.I've got a set of their shocker bbc cnc heads and would like to run 900 lift but afraid of problems with regular setup.thanks
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I had a small block Ford with ProMaxx heads.
Having taken them to ProMaxx and being allowed to watch them do a spring upgrade and seeing the care they put into assembling the heads with quality parts is impressive.
Great Video, I run the Promaxx 317’s on my 498 BBC with an 8-71 Supercharger. Gotta say these heads Are A Very Nice Piece and make Great Power, wasn’t mentioned in the video but these are Chinese Castings that are Professionally Assembled in The US by some Really Knowledgeable Guys, I’ve Spoke with them on a few occasions and couldn’t be more happy with their customer service and advice.
My son has a set of their "Maxx 200" sbc heads on his 383ci sbc and that thing rip's! He's had them on there 3 or 4yrs at this point, no problem's whatsoever. Castings looked great, no flash anywhere, nice and clean, I say good heads!
Awesome ERIC!
Sunday and dyno testing. Great!
Still hoping for a budget true oval 260-270 head for us street BBC guys. If it's Chinesium, so be it. We just want a lighter aluminum head to replace our 049/781 boat anchors. We just need something that performs about the same as a mildly ported GM iron head minus the weight. Most of us street guys don't spin our engines past 6000 anyway so the bigger 7500+ capable heads are more than we need.
The Brodix Race Rites and AFR 265's are awesome heads but, not easy on the wallet for guys with kids and a mortgage. 😁
Every Dyno comparison I've seen has the AFR 265 beating everything.
Really awesome, real world numbers!
Flow is more important for torque than most people think.
And size do matter 😉
Eric built me a set of ProMazx 317's for my 496.
.687/678 lunati HR, 248/254
11.2:1, dual plane, 850 carb, HEI, 2" Hookers, TH400 2800 stall, 250 NOS, 3.55 9", 87' Monte street car. I would buy them again.
Pretty good results and honestly that 625 lbs and 685hp and i think that's pretty good for a 496 and i get it a lot of people made more power on a bbc and all that but really with just lower buck heads and nothing top of the line what i think it's making good power. Amd if people say oh that sucks then bave them build there own big block and see how much hp there making. But keep up the good work
I have my afr 357mags on my 540 118 mm turbo does just fine
@@ryangulley2051 What was the point of your comment other than to let the world know that you those heads and a turbo? How did it in any way relate to what Chevy RC posted?
So you have those 357's, good for you - cute little head. I run SR20's ported by Morgan on a 583, so, I'm cooler than you.
A pretty small cam used in this too. Don't forget that.
would still love to see a pair of brodix dragon slayer 320s compared to these two heads!
GREAT JOB. WOULD HAVE BEEN NICE TO SEE WITH BIGGER CAM. I AM SURE WITH THAT CAM WOULD BE VERY STREET DRIVABLE
more cam, or just more valve spring, and titanium retainers, would have been over 700 HP
More cam and solid roller springs
I own a pair of Promaxx heads
Wayne
🍪
The dyno does not lie ✅
Unless they adjust the corrections or use the switch on some Superflow dynos that cranks up the output numbers. If you see a dyno printout, pay attention to volumetric efficiency, fuel flow info, and atmospheric conditions.
I love hearing the loading on a dyno run...like" yeah baby!pull you Clydesdale you!!"
Been running ProMaxx on my 390 BBF bored/stroked to 445CI. They are a pefect street head for the money. Honestly, i had edelbrock performer heads on the same car and these seem to be a better head. The heads are built and ported in the USA Even though they are casted in china.
Great info Eric, thanx
Great content!
Man I need to get my money to get some of those Promaxx for my sbf. I’ve been interested in primes heads for years back when I had my square body. That was 10 years ago, and those heads were dirt cheap! Like cast iron cheap. Still at a reasonable price for todays standards.
Multiply your .500 cfm by 2.3. It’s more accurate than taking the peak x 2. Also those estimates are peak capability. High compression/ big roller…
Great video ,awesome content keep up the great work 👍
Interesting thanks luv the videos! Seems traditional valve angle BBCs like the larger intake valve. Perhaps as the port gets straighter (9° vs 26/24°) the coefficient of discharge matters more?
David Vizard! Said that the big block chevy is under valve from the factory. They love big intake valves.
@@musclebone7875 Vizard has some good stuff for the more conventional builds. Agree with how he tends to use a tighter lobe separation with less duration (but similar overlap) on most builds.
Think as you get into more modern race heads someone like Darin Morgan is a good source
My 496 with a little more cam and afr 300 magnum oval port are a killer combo made 712hp but thats not a cheap Chinese head
Eric, have you ever had your hands on a set of the Promaxx 340cc BBC shocker heads??
Nope
It's interesting for sure. The valve size and compression ratio difference should account for more then a 20 horsepower difference though. So something Is right with the enforcer head. 2.30 valve. And shave .003 off the heads should bring you to about 118cc for the AFR would be really interesting to see on that motor run again. If they truly were equil and no valve float issue where these engines would end up
The afr are not even close. Their port design sucks. To get the same chamber size you would have to mill off .018 on the enforcer to get to 119cc. Besides the horsepower the torque sucked too. It was the worst off all of the heads tested.
How much difference in horsepower and torque do you think the small amount of compression ratio between the two heads being 119 and 123 could make you think that could make up a 10 horsepower difference then it's a little bit more comparable but the flow on the exhaust of those pro Max is outstanding
I will go ahead and order your book. Very good information. Cam specs are in the book, correct?
Yes
What intake gasket are you running on The promaxx heads in this video those match up real nice to the ports
I’m building. 496 with the longer rods and weisco pistons using the cam that comes in the 620 hp 572 crate engine been looking at the Skip White Bravo oval ports curious as to your thoughts on those
Do you have a video testing how exhaust flow only affects power, like if you only port the exhaust?
but they had a little more compression i run those heads on my BB
I'm less familiar with BBC stuff but is it common to have valve float issues with that (relatively) small of a cam?
yeah its pretty common or at least what Ive encountered during my time messing with this stuff. Big block Valvetrain is heavy
Would the same comparison of the test results carry through to a much larger engine, say maybe a 555 or 598?
Afr valve float earlier due to heavier valves & or retainers?
Do you think the promax three seventeen would work well on a five forty with mild cam
Do the enforcer bbc heads have smaller v stems like the sbc? seems they would wind up higher w/ lighter valves and same spring pressure hp and trq aside...yes?
They use 11/32 valves.
What was the port size differance, and how close was the intake port size to head port size on these 2 heads?
Moroso oil capacity’s are WITHOUT a filter.
Have you ever tested the AFR 3001 heads? I cannot find where you have tested them
Those were the ones tested in the video.
@@WeingartnerRacing thank you. I didn't watch long enough to catch that. My fault
I have been educated.
Price as tested? From the little
But I’ve searched the pro maxx are a lot more money no?
Promaxx are about $300 more
A lot has changed in the past few years! Promaxx used to be about the cheapest heads you could buy
Nice
How do we get all the books? I have the first two books, the two I take manifold tests for the sbc. Are there 3 books or 4 books now?
There are three total. Two SBC and one BBC. You can purchase through the link on my website.
Great info, have had lots of questions about off shore castings. What spring pressure to get to 6500?
Ask your cam mfr
What fuel were these test run on?
91
AFRs are Chinese made?
Hey Eric, what sort of torque and power do you think the afr heads would be making on 540 cube big block, with a lunati custom Hyd roller .646/.663 Lift
250/255 Duration @ .050
114LSA do you think the standard spring pressure wld be up for the task? If not what springs should I go? Currently building this combo and am a day away from bolting on the heads!
Did you mean to say 104 LSA?
I would say you would would make what the promaxx made
No 114
With a 540 and bigger cam?
@@OGAussieBirdman it's gonna make more than enough power to put a big ol smile on ur face. At 1.25-1.3hp/cube which is fairly achievable that's 675-700ish hp. A pretty good effort on pump gas na could be closer to 1.6hp/cube with conventional valve angle head but that's not common, more on E85...
540 cubes with conventional heads would probably like something around 106 LCA NA, on pump gas type compression. Duration I'd consider via overlap depending on other parts and what you're doing (like rpm...)
What's the rest of your build? Advertised duration (would guess an efi cam like 309/314, 114/112?), intake, what head, carb, headers, compression?
I've run a LOT of hybrid (solid pressure fed lifter usually morel) hyd roller combo on street for 10s of thousands of miles at 0 lash cold....
You HAVE to run up near the non billet cam core max over the nose pressures to get the benefits, if you don't run enough spring it will nose over exactly where the hyd lifter usually gives up around, drum roll 6200-6300 no matter how big your cam and ive done it with AFR 305cc among others....to 7500 on a 468ci and even boosted.....
Get close to what the core can handle, get a high quality ( ive even used the dissimilar metal bushing type like EZ rolls ) with direct pressure fed oiling ( made a huge difference in true street durability), and the induction/cam timing events are your limitation....assuming good geometry....
Not solid roller pressures just under...the last combo I had a hyd roller profile ground on a billet core with an F1A-94 blower and the sky was the limit on rpm or power....lasted years and still running to next guy ( that had a brodix head on it)...
Man with that low lift cam been nice to see it with 25-30 more lbs and lighter valve train...ive even changed rockers and moved rpm to peak...I fought this for 20 years..I got some high dollar hyd rollers to 6500rpm BUT its gonna tick cold or tick hot....my setup at a light zero pure cold lash was SO silent you can't even imagine it...
Weiand really missed the Boat with the "Track Warrior" Weiand should have designed the Track Warrior with exacting flange parameters to their Team G and raised the ports at the plenum. Works okay but went back to my extensively ported Team G. I'd like to see the BBC RHS Manifold sometime in the future.
That RHS is a real good piece.
Does anybody make a shaft rocker setup for promax heads
It’s the same one that fits the afr
@@WeingartnerRacing are you sure I called pro max and got no answers.I've got a set of their shocker bbc cnc heads and would like to run 900 lift but afraid of problems with regular setup.thanks
Which CHINESE head makes more power? there are two heads I will never buy. Power or not.
The day is coming that imports will be your only choice. All manufacturing is being sent out of America. We are about there now.
All by design....
No chinese for me. USA only!
Dont buy Chinese
When everything is Chinese, what will we buy then?
@@thereluctantgearhead4544 Not everything is Chinese..
@shootermcgavin2819 he's speaking in future tense
No chinese junk is going on my United States built Chevy engine!