LOW BUCK BBC HEAD TEST-PROMAXX VS AFR

FULL DYNO RESULTS-340 PROMAXX VS 345 AFR-CHEAP VS BRAND NAME? CHECK OUT THIS VIDEO COMPARING THE FULL CNC PROMAXX 340 BBC HEADS AGAINST THE AS-CAST AFR 345 HEADS. WE TESTED BOTH HEADS ON A 11.0:1 572 BBC STROKER EQUIPPED WITH A SOLID ROLLER CAM, MOROSO OILING SYSTEM AND SUPER VICRTOR INTAKE. BOTH HEADS PROMISED 800 HP AIRFLOW NUMBERS. WHO DELIVERS, AND AT WHAT PRICE?

[ziggybmw]

Just curious... why the thumbs down people? Who else is giving you all the info and data?! This is the best engine channel ever!

[ZaynsFather]

i paid around $850 for a set of Promaxx SBC cylinder heads. Were talking about 1400 plus for a set of AFR cylinder heads with the same specifications. For a inexpensive build and relatively close power numbers, promaxx heads are a great option. flow numbers are pretty close within 15-20 cfm at .500 lift . Cant beat promaxx heads for the price.

[Kyle-jcit]

Keep it up man! You are answering all the questions that forums have been asking for years and years and years

[scottb]

Back in the early 90's I bought a set of Dart 360's with bowl work done by them. Put them on a tall deck 540 with 11:1 compression and a little more cam. Couldn't come close to those numbers. It is amazing how far head development has come!
Thank you Richard!

[markusstrobl]

Got curious so I checked prices at summit. AFR: $2656. ProMAXX: $2545. So $100 more for a bunch more torque and made here. Easy choice, IMO.

[michaelparadisis]

Excellent test thank you for carrying out. Richard.
I’m about to build 582 with Mamosport 360cc Heads, solid roller 11.9 CR with Merlin X intake.

[david]

This popped into my feed after watching Eric Weingartner go over the design differences of AFR, promax and a another couple Chinese heads. He talked a lot about the valves used in each head and how they affected low lift flow.

[keepyourbilsteins]

Thanks for the perfect demonstration of the benefits of "area under the curve".

[justinp]

Richard, I am a 42 year old, respectable, relatively successful, middle aged family man. Why, when I hear this new music do I move around in my seat and hope that nobody notices? It makes me chuckle everytime I hear it. Nice choice.

[silvakevin]

Thanks for all the info. Just retired and can FINALLY build my dream car. Learning what I want will all these test you’re doing. 👍👍

[chrisa]

Thank you for all the great info! Just put together a 11.5:1 496 BBC w/ BB2x heads and a Schneider 272/282 707/714 Solid Roller everything you post has been a great help Thank you again sir!!

[BigUnk]

Thanks for the video Richard. I'm enjoying your channel keep up the good work‼

[carverac]

AFR all the way, for a couple hundred bucks, area under the curve and made in the USA!

[jackflash]

I am looking @ the above dyno chart from the viewpoint of a heads up 1320 contest. From 4600 to 5400 rpm the AFR heads are running about a 25 ft pound average torque advantage! From 5400 to 6400 rpm the AFR heads are still dominating the Pro/Maxx heads but with diminishing returns in the all CRITACAL TORQUE, until the ProMaxx heads starts to increase torque over the AFR head just past 6500 rpm. Try to imagine two rigs in class racing leaving the line, like that 25 ft pounds of torque HAS GOT TO MAKE A DIFFERENCE in getting out of the hole IF traction is equal between the two rigs. I would REALLY like to see the exhaust port flow numbers in these two brands of BBC heads, What are the angle of cuts & how many cuts are machined onto the valve seat inserts ESPECIALLY the exhaust valve insert? I mean those machined angles cut/ground onto the inserts alone can make the difference in low lift flow(up to 0.30 lift) for BOTH intake & exhaust.

In todays world it's the rapid evacuation of the spent gases in the combustion chambers that makes the difference in hp & torque, like the faster the exhaust is evacuated the stronger the pull on the incoming intake charge during valve overlap(free supercharger!). The headers look to me to be equal length or close & have 2.125" - 2.50" primaries plus about a 18.0" collector length(good). I would say that the extra torque the AFR heads are producing can ONLY be coming from a superior valve seat machining configuration. It would not surprise me one bit if the AFR heads come with a radiused cut coming OFF the valve seat cut & for that matter a radiused cut coming INTO the intake seat cut. Also the ProMaxx exhaust ports may be too large which would SLOW down the escaping exhaust gases which in turn would reduce the pull on the incoming atmospheric fuel charge during valve overlap. If you can check out the valve seat cuts/angles as well as the exhaust port size between these two brands of heads it would certainly be an interesting vid for sure regarding our community. Thanks so very much for sharing your experiences with our community!

[claytonfinney]

Richard you have the best content. I watch all of your videos. Thank you

[fstarockaburns]

For street guys the promaxx are by far the choice - 25hp is a very expensive jump and im sure 95% of ppl will be slightly terrified already driving such a motor around that they/we/I wouldn't bother dropping the 2k+ for marginal gains - gr8 comparison though and thanks for the hard work again!

[danh.]

Hey Richard, Another great test!

How about a comparison between the AFR $800 budget as cast 325CC Enforcer head part # 3001 on a 496 compared to the AFR full CNC head?

[superfuntime]

The set of A.F.R. cylinder heads on my basic small block chevy have been on there for 10 years. Never a problem.

[pjw]

Thanks for the low buck comparisons. Been curious about those cheap heads.

[rickygay]

I would like to see you do this same test with the sbc cnc promaxx head vs. Afr. Thanks