A couple things fwiw. Id say the compression is a tad soft as well but just my opinion on a race motor, never understood why guys stay so low, unless they plan to run alot of jug through it. Especially with an aluminum block and alcohol on top of that, but just my .02. Next to me the cam seems kinda out in left field maybe. But not knowing anything about the heads who knows. Do you have a port dimension or runner CC for them? I dont really care so much for what the flow numbers are as a gigantic rectangle can move alot of air and be so lazy it wont get out of its own way, but its always the first thing people ask for, like dyno numbers
It is definitely performing a bit anemic by the numbers, but since we have the dyno operator here he could best answer what that number translates to real world. Dynos area all different for sure and just tools.
FWIW our 572 B1 in the dragster ran .2 quicker and 3mph faster with a SMALLER header on it. We went from 2 1/4" to 2 3/8" step 3.5" choke 5" to a 2 1/8 to 2 1/4" with a smaller merge collector 3" choke 4"
Al, This engine is down from over 15.6-1 with Brewer heads 56cc to now 13.4 to 1 with B1's 69cc. because of the larger chamber and thicker head gasket to compensate for the above deck piston. I do not have the port dimension or cc, I only measured the exhaust port length to use with Pipemax, it was 4 inches at the floor. To be honest didn't think about needing it. I was recommended to use John Partridge @ Bullet as he is the guru for Mopar down there. I'm not opposed to a different cam but will wait to see what it does and how consistent it is before I spend another 6-700 for a new cam.
According to Pipemax single pipe should be 2.23-2.35 26-30 long with a 4-4.250 x 15 inch standard collector, or 2 step 1st - 2.23x13-15 long, 2nd - 2.35x13-15 long same collector or merge 3.5-4.5 with a 9-15 diffuser.
Headers on it are 2 1/8 diameter 29 length primary, with a merge collector 3.5" outlet x6 length with a 9* transition with a 4 " cone, Collector is 10 inch overall. Length is actually off as I measured from end of the slip to end of collector.
And I agree a dyno is just a tool. But it definitely is a good one..lol
Dave
