One pair of exhaust flanges for the Buick Nailhead hot rod motor (see motor applications below). These flanges are cut with a CNC HD (High Definition) Plasma cutter out of 3/8” Pickled and Oiled (P&O) steel. P&O material is hot rolled steel that has been dipped in acid to remove the mill scale and then a light coated lightly with oil to prevent rusting. The end result is less work to clean off the mill scale as needed with hot rolled mild steel.
364 cu. in (1957-61)
401 cu in (1959-66)
425 cu in (1963-66)
Ports designed to be used with 1 5/8” exhaust tubing.