COMP Cams 12-676-4 S/B Chevy Vacuum Solid Lifter Cam, 1600-6000 RPM
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There are many things that effect vacuum. Camshaft lobe separation, lifter style, intake manifold, piston rings, compression ratio and overall valve and engine condition. Due to many and varied engine combinations, Speedway Motors offers no warranty on camshaft and or lifters for either performance, vacuum or longevity.
Must be used with break-in oil additive (sold separately).
Vacuum Rule Cam Chart (GIF)
282-126764 Specs (PDF)
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