Quote:
Originally Posted by TJ's Chevy
Never rule out possibilities....GM did things that were not in the books.
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The thing is, TJ, that we know about these things, and have known for decades. COPO engines, etc. Everything that made by GM had a part number. A 427 into a Camaro? Sure, just check the correct boxes. A roller cam (lifters) in a 327? No. Traco-built Trans Am series engines used flat tappet cams... just like NASCAR engines.
The small block didn't get provisions for roller lifters until the mid-1980s. Trucks still had flat tappets into the 90s!