The Port/Flange Holes is the
number of bolts that hold the exhaust manifold to the head and the bolts
on the flange to ehaust pipe.
| HIGH PERFORMANCE PONTIAC EXHAUST MANIFOLDS | ||||||
| D-Port | ||||||
| Year | Application | Part # | Side | Port/Flange Holes | Miscellaneous | |
| 1968 | GTO 400 RA | 0777641 | R | 5 | 3 | R-same as 67 GTO RA |
| 9791637 | L | 5 | 2 | |||
| 1969 | GTO 400 RA | 9797072 | R | 5 | 3 | |
| (RA 111) | 9791637 | L | 5 | 2 | L-same as 68 GTO RA | |
| 1969 | 428 H.O. | 9797073 | R | 6 | 2 | |
| FB 400 RA 111 | 9779495 | L | 6 | 2 | L-same as 65- 68 HO. FB | |
| 1970 | GTO 400 RA 111 | 9799720 | R | 3 | 3 | |
| FB 400 RA 111 | 478140 | L | 3 | 2 | ||
| Round Port | ||||||
| 1968 | GTO 400 RA 11 | 9794033 | R | 5 | 3 | |
| 9794035 | L | 5 | 2 | |||
| 1968 | FB 400 RA 11 | 9794036 | R | 6 | 2 | |
| 9794038 | L | 6 | 2 | |||
| 1969 | GTO 400 RA IV | 9797075 | R | 5 | 3 | |
| 9794035 | L | 5 | 2 | L-same as 1968 (A) | ||
| 1969 | FB 400 RA IV | 9797074 | R | 6 | 2 | |
| 9797038 | L | 6 | 2 | L-same as 1968 (F) | ||
| 1970 | FB & GTO | 9799721 | R | 3 | 3 | All 1970 and later |
| 400 RA IV | 478141 | L | 3 | 2 | manifolds are 3 bolt port. | |
| Except 455 SD. | ||||||
| 1971-72 | FB & GTO | 9799721 | R | 3 | 3 | R-same as 1970 A & F |
| 455 H.O. | 478141 | L | 3 | 2 | L-same as 1970 A & F | |
| 1973-74 | FB 455 SD | 490802 | R | 5 | 3 | |
| 490803 | L | 5 | 2 | |||