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Depends on which engine it is. There were 3 basic options...California not included, for the 78 T/A. The entry level Pontiac 400 and Oldsmobile 403 were rated at around 185HP. You could also order a 200HP (maybe for 78 a 220HP) 400....which basically came with a little higher compression head. I know that the 220HP was offered for '79...but it's been a while since I've looked up those specs and do not remember if the '78 was 200 or 220.
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