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Guest
Guest
A street engine doesn't need a large intake valve. The only reason I use the 1.6 in the intake is some 49-53 blocks have bad seats and the 1.6 allows me to get into some virgin metal for a good seat. 59 series blocks have hardened seats in both I&E so you have to use the 1.5. The stock chevy valve is .060" longer than the Ford valve which requires a shim under the valve spring. It also makes up for the smaller base circle of most reground cams. Hope this helps.
Ol' Ron
Ol' Ron