I'm a dumbass. Everyone I've talked to has called them H.O. heads.
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1977 Cobra II, 306ci, Speed Demon 650, Performer RPM Air Gap, ported high swirl heads, 488/.460 Blue Racer Cam, 10:1 Keith Black pistons, Z-Code T-5, 3.40 Trac Lock, SSM Lift Bars
RHC Member #83
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