The valve notches moved closer to the center of the bore because of the change to a more vertical 14 degree inclination angle.
A original 068 cam with .406” to .420” lift would not be a problem, but with .470” lift I would with out fail mock assemble it with clay and without a head gasket and with light checking springs on the 4 end cylinders to see what you have .
Do you know what you have for deck clearance now?
Off the top of my head if I recall right if you have .020” deck clearance now then with a .039” crush head gasket, and with running .470” lift I think the exh valve was ok the last time I did a build like yours.
The intake valve is the wild card !
You need a dead nuts minimum of .045” valve to piston clearance and if your forced to run things that close your valve springs better be super dam good!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
Last edited by steve25; 09-02-2021 at 06:42 AM.
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