Quote:
Originally Posted by jocko
Have never had to do this and have used 1.6 rockers before. Where did you hear this? Is this Vortec-specific or something? Not the case with stock Gen 1 sbc.
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I have never used 1.6 rockers but believe it's just for the Vortec heads. You may get by without drilling but some say you need to drill out the passages for the push rods with a 1/2 inch drill bit to be on the safe side.