Gmpp Cylinder Head
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The supplied single valvesprings measure 101 pounds at installed height (1.78 inches), 275 pounds at 0.525-inch lift. These are the same springs (PN 12551483) used on '96 LT4 Corvettes and ZZ4 crate engines. GMPP says they're good up to 0.530 inch lift and work great with our test car's 0.480-lift hydraulic cam. View Related Article
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