Reply to "engine hp"

Marc,

I am personally very familiar with the parts installed in Hani's motor, having run several Clevelands with flat tappet hydraulic cams through a dyno back in my day. So making a mental dyno run was easy for me in his particular case.

Your motor presents a challenge as I have never dyno'd a motor with a hydraulic roller cam nor do I have an idea how the AFR heads flow or respond on the dyno. I'll kinda walk you through my mental process though, if you'll find that entertaining:

The AFR heads would be big heads on a smaller displacement motor, but on a 408 cubic incher, they should be quite docile. The specs of the roller cam are also quite docile for a motor displacing 408 cubic inches, and especially docile for a motor with Windsor heads (smallish ports). I am totally unfamiliar with the AFR heads as far as what they are flowing at 0.542" lift. I have no idea what you have in the way of exhaust, which is very important. Finally, the Victor junior intake & big carburetor will make more torque above 5000 rpm, and less below 5000 rpm. This will improve the peak bhp number, and decrease the peak torque number. The carb looks sized very well to the motor. Not being familair with the parts, it's hard for me to guess the power band, I'm assuming peak bhp with the mild cam will be achieved well below 6000 rpm. The single plane manifold doesn't quite compliment the rest of the parts, a dual plane, like the Edelbrock Air Gap or Performer, would be a better match. But the single plane manifold will help stretch the motors legs a few hundred rpm higher before the power band flattens out.

The compression ratio looks too high for this mild combination.

Again, assuming the exhaust system is sorted out, not restricting power, and assuming the carb & ignition will be calibrated on the dyno, I'll guess 450 ft/lbs torque, 450 bhp. The peak bhp number may be below your expectations, but I am assuming the bhp peak is occuring around 5500 rpm, and therefore it will not be much higher than the torque figure at that rpm. The Victor junior manifold can very well slide the peak bhp a little higher in rpm and therefore the peak bhp number may also grow a bit.

After you dyno the motor, get back to us and let me know how far off I am. I'll find that entertaining myself.

Your friend on the DTBB, George