I’ve done a few sets of Speedmaster BB heads.

They work fine when properly prepped.

We put a set with a Stage 1 type job on a 446 with an rpm intake, qft ss830 carb, Mancini rockers, .540 solid cam, decent rods and flat top pistons.

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