1979 Pontiac Trans Am And More - Tech Q&A
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A High Energy Ignition (HEI) system was standard fare on all Pontiac models beginning in 1975, and this particular unit, No. 1103315, is specific to the '78-'79 T/A 6.6 engines. Pontiac's 1979 Service Manual Supplement states that it provides 17 degrees of centrifugal advance by 4,600 rpm, along with 25 additional degrees of vacuum advance. View Related Article
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