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increasing the lash in mine (i.e. making the cam look smaller to the motor) made a bunch more power everywhere.


That was with ex manifolds, correct?

The increased lash making more power if there were headers installed on the motor may or may not have played out the same.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads