Quote:
Originally Posted by steve25
He still has the issue of needing early rockers.
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He can run 2 different length pushrods in the same engine, correct.
After all BBCs run 2 different length pushrods since they were designed, as do fords and many late model GM V6s.
The valve sizes are inconsequential, and the different valve angle in the heads won't come into play unless he would use a cam that was over .450 valve lift. Stock rocker arms are the same part number, 65-79. Pushrod length is the only difference from 66 to 67.
If his rocker arms don't have the holes under the pushrod, they are 1964 or earlier. Starting in 1965-1979 all Pontiac V8s oiled the rockers thru the pushrod. pushrod length changed in 1967 to a longer pushrod due to the cylinder heads being redesigned.
If he only wants the car to move under it's own power the choice is pretty simple. Use the correct length pushrod for the cylinder head, and only use the late style (65 and later) rocker arms on either head. Problem solved.