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Is the 3.9L engine in the same family as the standard 3.5L Buick aluminum engine? I was told by a rep at Hedman that they were commonly used in these vehicles for many years. He said if my 3.9L is in the same family, then they sell headers (PN 39800) that will definitely fit the RRC.
So, how does one know if the 3.9L RRC engine is from the same family as the standard 3.5L buick aluminum engine??
So, how does one know if the 3.9L RRC engine is from the same family as the standard 3.5L buick aluminum engine??