quote:
Originally posted by ron norman:
Do Big Bore Headers/Exhaust systems increase Horsepower (HP) at low RPM, hi RPM or both? What is the effect on the power band, broader, flatter, more torque at low RPM only? Does a 351-C require some back pressure to funcion better across the powerband? What HP increase can one expect for Big Bore Headers/Exhaust Systems? Should the exhaust system only be upgraded if the intake system is upgraded?
Lastly, were the 351-C engines supplied to the De Tomaso Factory balanced and blue printed or in any way given preference over 351-C engines going into Mustangs, Boss 302s, Mach 1s, etc? Is the Red-Line of a Pantera rated higher than those factory cars?
This depends on your came timing, if you change your came timing (just a few degrees)and put an exhaust system with more flow on it, you can expect more power in the high rpm range, as well in the low rpm range whith wide open throttle.
Only in the low rpm range with almost closed throttle you loose some torque, and the car won't run as smooth as it did before.
If the intake is upgraded, the gain is even better, up to a certain point, if you want to cross this point, you'll have to invest some money in your engine.
Paul.