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Exclusive Behind-the-Scenes Look at GM’s ZZ632 RSX Big-Block Cylinder Heads!Go inside GM’s Performance and Racing Center to check out the new 1,004-hp crate engine’s revolutionary cylinder heads.
The 5.3L LC9 Vortec is a performance engine at heart ... cast-aluminum cylinder heads and engine block, a composite intake manifold, a cast nodular iron crankshaft, and powdered metal connecting ...
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