What's the bottleneck in my engine?

[MidOHasp]

I'm running a very similar motor, major differences being Dual Plane intake and AFR heads. From what I've heard, the heads may be a small bottleneck. I agree, the cam is better matched to an RPM intake rather than the Vic Jr. So if you kept the cam and put on the RPM manifold, you'd probably see an increase in torque, but not much more power.

Our power is about the same...within a few percent. Could have been the day it was dyno'd. Yes, there is a correction factor, but my dyno guy said it isn't that accurate. We dyno'd on a pretty hot day, and he said that if we were truly at sea level and 60 degrees, it would've been better than w/ the correction factor. But I don't live at sea level and it's not 60 too often when I'm out.

My torque is probably higher because I'm running 185cc AFRs on a 408. From a power perspective, that size motor (and yours, too) would need at least 205CC heads (and a bigger cam and a single plane intake). But running that narrow of induction (RPM intake) and heads, it's a torque monster.

I would say that a lot of numbers may not be terribly accurate. If you believe ALL that you read, the average 427W stroker from Keith Craft or Roush is making about 600-650HP and runs on pump gas, etc... I doubt it.

FYI my power peak is 5700, TQ peak is 4400, but TQ is between 540 and 544 from 4200 to 4800 RPM.

I'd have to agree w/ Pat. Your numbers (and mine) are more realistic. The 600+ smallblock numbers (naturally aspirated) are less realistic. Possible, but not without a very nasty cam, 11:1+ compression, huge intake runners, etc...

That's my opinion, at least...interested to hear others.