"If your head were machined a lot (say 1/16" or more), shims under all four
pedestals would restore the original geometry. However, they would surely be
classified as four "thick" shims. The two originally fitted to later 5-main
engines (after 1968, I believe) were actually quite skinny - from memory,
I'd say about .010" at the most."
If you don't know the history of your head is there any way to measure so as to
know if it's been machined before or not. It seems that otherwise it would
be very hard
to get the correct thickness or shims and setup the "geometry" correctly.
Thanks,
Gregg Baker
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