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GM Performance Products' ZZ572/ 620 Deluxe crate engine is one of the General's best-sellers. This 9.6:1, 4.560x4.37-inch hydraulic-roller motor is based on a Gen VI tall-deck block with a machined fuel-pump boss. (Not all Gen VI blocks have this provision.) A turnkey version retails for $12,786 through Scoggin-Dickey parts center; you're lookin' at $8,000 even for a short-block.