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#12
05-03-2024, 02:30 PM
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I am trying to find my notes from 25 years ago in regards to the valve to piston clearance deal, but here’s what I recall off of the top of my head.
Using 428 pistons in a 421 build with its original heads would allow .480” lift to be run. On the other side of this a 421 with its original pistons and fitted with 67 and up big valve heads would only allow a safe .450” lift. The first part of what I posted here is not carved in stone until I find my notes.
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