Actually, several have been boosted with both turbos and centrifugal superchargers. I don't know of any max-effort race builds but I know of at least one that made over 400 horsepower reliably and I would suspect that the bottom end would support quite a bit more with some forged rods and pistons. Chevy small-block internals are easy to come by, making rod and piston choices readily available.
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Don Keefe,
Founding Editor-in-Chief, Poncho Perfection Magazine (October 1, 2015- present)
www.ponchoperfection.com
Contributing Editor: Collectible Automobile (1999- present)
Author:
"Grand Prix: Pontiac's Luxury Performance Car" (Released April 27, 2007)
"How to Restore Your Pontiac GTO" (Released July 15, 2012)
"Pontiac Concept and Show Cars, 1939-1980" (Release Date April, 2016)
"Leave the gun, take the cannoli."
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