yes you can get more horses with smaller CC heads. The less CC in the heads the higher the compression you will get, resulting more horsepower. You just do not take 283 heads and put it on a 327 or 350. You raise the compression but it can't breath because of small ports and valves.
3986336 71 350 76CC
3932441 67-72 327-350 76CC
They are fairly matched
3991492 are 64CC high performance heads. It will wake up the engine.
hope this helps
Last edited by lg1969; 10-26-2011 at 04:49 PM.