What all machine work is needed for vortec heads? I know the valve guides have to be machined to handle more lift, but I heard the pushrod guide holes have to be machined to use 1.6 rocker arms or else they will rub. Is this true or can I get away without it? Thanks for the help.
I used a die grinder to elongate the pushrod holes. It doesn't take much, just sort of a cleanup
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