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Re: 350 400 heads
I would let a machine shop drill the holes. If they mess the cylinder head up its on them. Doing it yourself you are out if you mess it up. Maybe practice on a set of junk heads if you really want to do it yourself.
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73
1992 Camaro RS 305 TBI
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