70-81 & 68-72 PONTIAC Round port Exhaust Manifolds 2.5" Oversized for 2nd Gen Firebird & GTO
Pair, (LH and RH) Ram Air Round Port Manifolds with Larger Collector.
Fits 68-79 GM A-body; 70 1/2-81 F-Body; 69-77 G-Body, 69-81 B-Body with these heads: RA II, RA IV, 455 HO, 455 SD, Edelbrock heads. Collector size is 2.45" for cars with "large pipe" exhaust systems and/or intake/head mods. The larger collector gives 14-16% more flow capability than stock collector castings. Lifetime warrant on material and workmanship!
Manifolds are 455SD design (the largest Round Port design).
Original casting numbers on Manifolds: LH 490803, RH 490802 Exact Reproductions from GM blueprints.
RA IV casting numbers now available upon Request!
LH requires 2 bolt flange, RH requires 3 bolt flange (sold separately)
OPTIONAL CERAMIC COATING:
Castings are port matched to Pontiac Blueprint then thermal barrier ceramic coating is applied on interior and exterior. Choice of Silver or Gray. 3-year Guarantee. Will not burn off, fade or peel. Reduces header temperature 40%! Silver is chrome-like. Gray looks stock.