What's the bottleneck in my engine?

[MidOHasp]

blykins...

232 Intake 240 Exhaust duration at .050
.576 Intake Lift
.580 Exhaust Lift
1.72:1 Rockers

Therein may lie the difference. I'm running more than 0.030 additional lift. Also, that may be further compounded by the rockers. Not sure what rockers you have.

The Roush 402 most likely has bigger cam. That's how they do it with 23 fewer cubes.

I think it would be kind of fun to build up a non-stroked 351 (357), bulletproof forged parts, solid (and big) cam, big intake and heads, and just flow the hell out of it up to 8K RPM.

But what we have are some really exciting street motors. I knew I'd lose 30-50 HP with the RPM manifold. It certainly wasn't a cost issue, they cost the same. I just wanted to match a 1500-6500 Cam to 1500-6500 heads to a 1500-6500 intake to a 400 cubic inch 6000 RPM carb, etc... That combo is a TORQUE motor. That's why I did a stroker in the first place. I'd never trade my motor in, but wouldn't mind a high revving monster sitting in the garage next to it, either.

The BBC comparison makes little sense. 2.02(or 2.05)/1.6 valves ARE the big valves on a SB Ford or Chevy. Totally different animals.

Gordon,

400CFM?? wow..... Don't have clearance for the 2" element with that air cleaner assembly, but do if I get a smaller assembly. Any suggestions??

JP