Pontiac Cam Specifications Attention Please. Check your "Bow Tie" engine building preferences at the door, the following specifications are for Pontiac engines. In the typical Pontiac head the intake port is 79 - 85% larger than the exhaust port. Pontiac engines have "dual pattern" cams ground with about 10 extra degrees of duration on the exhaust lobe. |
| Firebird App. | Pontiac Part # |
Duration @ .050 Degrees Int/Exh |
Adv Duration Degrees Int/Exh |
Lobe Center Degrees Int/Exh | Lobe Separation Angle |
Overlap | Cam Lift Int/Exh | Gross
Lift Int/Exh |
Gross Lift
Int/Exh (1.65:1 Ratio Rocker) |
| 1977 TA6.6 | 549431 | 274/289 | 62 | .249/.270 | .374/.406 | .411/.446 | |||
| 1978 TA6.6 | 10003402 | 273/289 | 54 | .270/.271 | .406/.407 | .446/.448 | |||
| 1979 TA6.6 | 10003402 | 274/298 | 55 | .249/.270 | .374/.406 | .411/.446 | |||
| 1967 400, 1968 350, 1973-76 400 w/ AT | 9779066 (E) OEM | 200/210 | 273/282 | 106/116 | 111.25 | 55 | .272/.271 | .408/.407 | .449/.448 |
| 1967-68 400HO w/ MT | 9779067 (P) OEM | 200/213 | 273/289 | 113.5 | 54 | .272/.271 | .408/.407 | .449/.448 | |
| 1968 400 HO
MT & RA-I AT, 1969 350 HO MT, 1969 400 MT, 1970 RA-III MT/AT, 1971-72 455 HO MT |
9779068
(S) |
212/225 |
288/302 |
113/118 | 116 |
63 | .272/.271 | .408/.407 |
.449/.448 |
| 1967
RA MT/AT, 1968 RA-I MT, (Some 1969 GTO RA-III MT) |
9785744 (H) |
224/236 |
301/313 |
112/119 | 115 |
76 | .272/.271 | .408/.407 |
.449/.448 |
| 1968-70 RA-II & RA-IV MT/AT | 9794041 |
230/240 |
308/320 |
112/115 | 114 |
87 | .313/.313 | .470/.470 |
.516/.516 (Stock in RAIV) |
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