Includes One Straight Lake Header Kit for the Big Block Chevrolet 396, 400, 427, 454 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.
1 pair – 30″ long steel megaphones (1-5/8″ inlet & 3-1/2″ outlet) – 4″ outlet available upon request
2 – 2″ OD, 0.065″ wall plain steel (not aluminized!) 70 degree mandrel bends
6 – 2″ OD, 0.065, 10″ long plain steel tubing
1 pair – 3/8″ thick exhaust flanges – specific motor application listed below
(photo is shown just for reference, contents listed above is actually what you will receive)
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” round exhaust tubing.
These flanges are designed in CAD and are test fit on an actual head to make sure proper fitment is achieved.
Awesome thick flanges, reasonably priced out, the only thing id consider would possibly throwing in two extra tubes for the beginners that want to try it out themselves, no room for error with only the right amount of material.
Robert Chamberlain (verified owner) –
Good material and easy to customize to fit my rat rod