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Originally Posted by Brian Baker
How do you profess to get the port tall enough without getting into the valve cover rail to make 400-cfm and retain the pushrod "bulge"? What compensations will be made to the spring seats and the area above the port roof to retain wall thickness integrity?
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I'm pretty sure the highport heads are physically taller than a E-head or iron head = You have more material to work with. I was told that the pushrod hole is offset .200 as cast. I've heard that you can go to a 2.55" tall port without much trouble. With a 1.2 x 2.55 port you should have enough CSA to feed a 505 to 6600rpm.