Hey guys I have an Oldsmobile 425 with stock A heads. I need to convert the top end to adjustable rockers without having to take the heads off for machining. The only kit I was able to find that I know fits that criteria for sure is the Harland Sharp S50026A. It's almost $600. Im sure it's a quality product and worth it but this is a stock motor and very low budget. Is there a cheaper alternative? I know some kits are cheaper but require drilling the rocker stud holes to 7/16. But they don't specify if that means you have to take off the head. I won't mind drilling and tapping if I don't have to take off the head.
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