Cadillac 331-429 Intake Flange


Includes one pair of intake flanges for the Cadillac 331, 365, 390, 429 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 lightly coated with oil.  The end result is less work to clean off the mill scale as needed with hot rolled mild steel.


Motor Application:


            331 cu. in (1949-55)

            365 cu. in (1956-58)

            390 cu. in (1959-63)

            429 cu. in (1964-67)

            *more applications/years may work, verify before purchasing.


Ports designed to be used with 2” OD tubing.


These flanges are designed in CAD and are test fit on an actual head to make sure proper fitment is achieved.


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