as far as weight differences, 40 years ago john sawruck and I were talking about my 70.5 GT37 400 3 speed manual car and how much lighter it was than a comparable gto. we started making a list of stuff we could come up with. example, gto front bumper heavier than the gt, rubber mat lighter than carpet, really cheapo door panels, seats etc compared to the gto. he also sent me copies of paperwork from Pontiac that showed performance tests on all their 70 year models. and the fastest 1/4 mile time was a GT-37 400 4 speed (WT with 12 heads) and a 3:90 posi. yes it was faster than a ra4 gto and firebird.
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