Headers?? 264 cams?? Bigger crank pulley? Larger throttle plate?
Stock manifold, I've been wanting to check my cams for a long time -- now I'm really motivated, stock crank pulley & boost, have not checked the TB.
Hey Bill,
I have been trying to think back when I had the 294 cams. I remember it had a smooth idle, but the vacuum was down to I think 19 or 18 in-Hg. Right now, my car has a great idle, makes 30 MPG, and has 20-22 in-Hg vacuum.
Everything points to big cams: I'm making more power higher in the rpm band, and I'm making less bottom end power...
| Peak HP rpm | RPM % difference | Peak TQ rpm | RPM % difference |
Rated: | 6,400 | | 4,000 | |
Actual: | 7,400 | +15.2 | 3,750 | -6.4% |
If anything, the torque number seems within range at 117.5 lb-ft at the ground, which would be...
4th gear correction: 100.77 TQ to the ground.
Possible TQ losses:15% power loss: 116 crank TQ
20% power loss: 121 crank TQ
25% power loss: 126 crank TQ
30% power loss: 131 crank TQ
Right -- less torque than stock & more HP at a more narrow and higher power band points to aftermarket cams.