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GMPP’s ZZ4 partial engine (PN 12561723) includes a block (with four-bolt main caps on the center three journals); a forged one-piece rear main seal crank; main, rod, and cam bearings; powdered metal rods; rings; and LT1 high-silicon pistons with offset pressed pins. As delivered, GM’s short-block is really “short”—lots of parts are needed to make it a runner. View Related Article
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