will J heads work on a 318? And many many more questions.

dodgetkboy78 said

2.02 yes, 1.88? Not enough of a difference to notice from the stock valve. If anything, the chamber of the 302 will shroud, not the cylinder bore.

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the whole point of a 302 chamber is to promote swirl.. so chamber mods like that are not recomended IMO.
once you start milling heads + high lift cams + big valves the valve gets pretty close to the bore wall.
even the 1.88 valve will be to close for comfort with a moderate lift camshaft. but all this is JMO.