Well start out by figuring you have what .660-.675 max lift after subtracting valve lash, pushrod deflection, and angle loss. Now It’s at that lift for a split second so how well do the heads flow at .550 and .600 lift.

Last edited by pittsburghracer; 11/22/19 12:27 AM.
1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

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