Exhaust Manifolds

Short answer: Yes — the 350 and 400 D-port manifolds interchange (basically all 1965–70 Pontiac manifolds fit 1967–69 Firebird V8s; e.g., a 1973 350 pair fits a 1968 350). Only the Ram Air and H.O. “Long Branch” manifolds are hard to find (~$325/pair for ductile-iron repros, which are better than originals); all others run ~$100/pair. Beware used manifolds — 30 years of heat cycles leave many with stress cracks that are often worse than they look.

9779325 (RH)  63 T/4, 63-66 T/8-P/8, 67-68 F/8-T/8-P/8 (exc HO/RA)
9777755 (LH)  67-68 F/8
9791607 (RH)  67-69 F/8 Ram Air, H.O.; 68 P/8 428 H.O.
9779493 (RH)  67-69 F/8 Ram Air, H.O.; 68 P/8 428 H.O.
9779495 (LH)  67-69 F/8 Ram Air, H.O.; 68 P/8 428 H.O.
9777641 (RH)  67 GTO Ram Air, H.O.
9777646 (LH)  67 GTO Ram Air, H.O.
490802  (RH)  68 GTO Ram Air, H.O.
478141  (LH)  68 GTO Ram Air, H.O.
9796992 (RH)  69-72 F/8-T/8-P/8 exc HO/RA, 307
9796155 (LH)  69 F/8 exc HO/RA
9797073 (RH)  69 F/8-P/8 RA III, H.O.

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