A home port job on a set of 915/906s or 346/452s goes a long way.
Only if you know what you are doing , if you don't it's REAL EASY to make them flow WORSE than untouched heads .
Quote: In fact Dwayne Porter has made something like 460 hp with a stock displacement 383, stock 906 heads I beleive the ports were completely untouched, and a tad over 250 degrees of duration @ .050 and around 11:1 compression.
Once took off the stock intake and carb that 383 made 500 HP , propelled his heavy B body to LOW 11's ..
