Includes One Straight Lake Header Kit for the GMC 305, 351 V6 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. The end result is less work to clean off the mill scale as needed with hot rolled mild steel.

Kit includes:

1 pair – 30″ long steel megaphones (1-5/8″ inlet & 3-1/2″ outlet) – 4″ outlet available upon request

1 – 1-5/8″ OD, 0.065″ wall plain steel (not aluminized!) 180 degree mandrel bend

4 – 1-5/8″ OD, 0.065, 10″ long plain steel tubing

1 pair – 3/8″ thick exhaust flanges – specific motor application listed above

(photo is shown just for reference, contents listed above is actually what you will receive)

Motor Application:

GMC 305-351

305 cu. in (1960-69)

351 cu in (1965-68)

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

Ports designed to be used with 1 5/8” exhaust tubing.