1967 Pontiac GTO - Supercharged Silver Streak
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Why not just build a normally aspirated big-inch Pontiac to make this power? Scott says, "Pontiac engines can't be bored to monster engine sizes unless an Indian Adventures block is used. So with a factory block the bore is usually .030 or .060 over and the cubic inches are increased further with stroking. Anything more than a 3.75-inch stroke creates a lot of parasitic drag. Many hobbyists who want to race want the engines to make power from 3500 rpm to 6500, or even 6800 in many cases, and you can't beat on a Pontiac with a 4.25-inch stroke like that. We normally use a 400 block for applications such as that because it has no valve cutouts in the top of the block to interfere with head gaskets, and the 3.75-inch stroke is what we want, to limit parasitic drag." View Related Article
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