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  1. 1964-1974 Tempest/LeMans/GTO Engine Tuning
    Hey! Tony here I have some questions about Buttler Perfomance 428 stroker kits. I have a 1967 GTO with a 1968 428 Engine that i have with. 0.30 over boar I was woundering if i can buy the 428 stroker kit from butlerperformance and overboar the cylinders to 0.35 so the boar ends up in...
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