BORE SHROUDING TEST: 4.03" vs 3.91" Edelbrock RPM Heads Really Fit a 318? Project Mission Impossible

You can run like a 100 hp of air/fuel through an engine to 1000's of hp of air/fuel, compression generally is gonna make those numbers vary like 0-25%. So if you run a 100 hp of air/fuel at 7:1 and crank it to 17:1 you might gain like 20-25% + power.