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

360Z28 said

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.

Click to expand...

Swirl yes, flow no.......

A 1.88 is real close the the chamber wall. Anything in a 3.91 bore is too close for comfort, but the difference between a chamfer, and a non chamfer, with the restricted chamber of the 302's, it's not something you will feel.

I built a X head 318 (3.94 bore) and chamfered the cylinders, but I didn't have a choice, for his build, it would be about as effective as lowering the oil weight, time or money better spent on a windage tray, ect.

(IMO)