Alright I am wondering how much of a difference there is between G heads and J heads I know the G's are supposed to flow better but I am getting conflicting info on whether they have big valves or small valves in them. I think G heads came on a 71 455 what was the compression ratio for a 71 455? I am wondering because I wanted to know of the pistons in the 71 would have smaller dishes in them then my 74 J head 455. Would it be worth it to swap to the G heads?
[ June 29, 2004: Message edited by: taguy1979 ]</p>
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