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

rumblefish360 said

... I also echo the 318WR actions and results. It’s amazing how the 318 gets the hard hitting disrespect hammer so often. I do prefer to build one in the future with as much over bore as I can get out of it but it’s not the end of the world if I don’t. I would just prefer it...

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I prefer the smallest bore to keep the cylinder walls as thick as possible. Maybe grind a notch and radius the area of the intake valve (staying out of the ring travel). But to tell the truth, I've run 1.88 intake "J" heads on a 273 with a 3.665 bore. Guess what? It ran like a 340, no notches or special tricks except centering the chambers on the bores. The most important thing to making power with a short block is to seal the bores at wide open throttle, WOT.