Chevrolet Big Block 396-454 (2.25″ Round Port) Exhaust Flange


Includes one pair of exhaust flanges for the Big Block Chevrolet 396, 400, 427, 454hot 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.


Motor Application:

Big Block Chevrolet

            396 cu. in (1965-96)

            400 cu in (1965-96)

            427 cu in (1965-96)

            454 cu in (1965-96)

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


Ports designed to be used with 2 1/4” round exhaust 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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