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  1. Smog Concerns: which pistons, PM6 or PG6?

    Engine Building
    I'm building a D16Y8, presently stocking up on parts. I've come to the point where I have to decide on pistons. From the tons of research I've done on this forum/google it's PM6 or PG6 pistons. Nobody I’ve read about has my situation thus far, so I'm guessing PM6 pistons will be the way to go to...
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