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#1
06-01-2022, 04:44 PM
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W72 T/A Cam - 1977 vs 1978/79
I've been wondering why Pontiac used a different cam in the 1977 W72 T/A than the 1978/79 W72s.
The differences in specs are modest but meaningful, with the 1978/79 cam being slightly more aggressive: Cam, AID, AED, ID@050, ED@050, IL1.5, EL1.5, LSA, OL, CL 1977 549112, 274, 298, 190, 213, 0.365, 0.41, 114.5, 55, 116 1978/79 10003402, 273, 289, 200, 213, 0.41, 0.41, 113, 54, 118 Did Pontiac undershoot for 1977 on purpose? Emissions standards certainly didn't get less stringent in 1978 yet they went to a more aggressive cam. It would seem they left power on the table in 1977. Curious if anyone knows the history or rationale there. And also why they didn't go with the 067. |
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