Quote:
Originally Posted by olddog
His work suggests that if I stick a set of heads that would work best on a 400 cid stroker on a 302, I could make the same power at a higher rpm with less torque. I wonder if this is true today.
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Well sure...
Take a 351C with 4V heads. It makes some great horsepower and great torque. Now put those 4V heads on a 302 (Boss 302). You get great horsepower at a much higher rpm, but less torque and bottom end response.
That rule has always applied. Extra displacement eats up camshaft duration and port volume.
I can make 500 easy horsepower with a 408W using 205cc heads. I can also make 500 easy horsepower with a 347 and those same heads. However, the horsepower peak will be much, much higher and the peak torque value will be much, much lower. Port velocity will be worse for the smaller engine as it doesn't have enough butt to take advantage of the larger head. Therefore throttle response and low end performance will suffer.