029 inch more exhaust lift than the GM ZZ4 cam. Flow data based on Cylinder #1 intake and exhaust port. Hovis Standard Features: Hovis billet aluminum valve covers. The same could be said for the venerable small block Chevy. As an example, we have tested a 383ci small-block with 9. Best heads for 421 sbc 60 exh and have a #2975 vic jr intake with holley 850 dp.
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