5.7L Third-Gen Engine Build - Balance Of Power :Decision '07
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The original small-block Chevy (SBC), two-piece, rear main-seal crankshaft is on the right and a single-piece, rear main-seal crank is on the left. In the foreground is the seal itself. The blocks are also different, having provisions for the different crank seals, as well as a different lifter-bore height and cast-in roller-lifter spider mounts in the newer block. You can interchange short-blocks/heads as long as you use the correct crank, flywheel, damper, timing chain, cam, and lifters with each block, and the correct manifold for each type of heads. Confused? You're not the first. View Related Article
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