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.

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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
(1.5:1 Ratio Rocker)

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)
OEM

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)
OEM

224/236

301/313

112/119

115

76 .272/.271

.408/.407

.449/.448
1968-70 RA-II & RA-IV MT/AT

9794041
(T) OEM

230/240

308/320

112/115

114

87 .313/.313

.470/.470

.516/.516 (Stock in RAIV)

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