Very disappointed with my 347 dyno!

[8850]

The technician told me that slicks expand causing the dyno not to be able to read torque. He also told me they were holding good to the roller.

I do feel the hp verses rpm are probably correct as I ran .309 slower taking my engine to 6000 rpm verses shifting at 5000. And this was with a better 60' on the slower(6000)run.

I paid $75 for the dyno. They did three pulls and with a wide band 02 sensor installed to check fuel mixture. Not sure what brand dyno they have. I thought this was reasonable.

Right now I feel that my 1 5/8 shorties is the culprit. I am ordering 1 3/4 tomorrow and will give them a try.

Eric,

I agree with you that this engine should pull much higher than it does. Comp Cams told me this cam should pull to 6500.

Rev,

Yes, I know the hp should be much higher than 4350 rpm. My engine has a problem.