I'm sure that at least the 04-06 GTOs had LS 1 and LS2 in them so there for a Pontiac engine,the real sacrilege is putting a 403 in them My TA 78 has the orginal numbers matching engine , but got RID of the 4 speed and put a Tremic TKO a world of difference suppose that is bad also. PUT a Pontiac motor in my Camaro its out of a 06 GTO
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JIM
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