I think you are talking about the egr system right? If so, why do you want that? I think the J heads were used until maybe '76 or '77, somewhere around there, you are right about that. Even the early 455 heads like Cs had the egr "bumps" on the insides of the intake runners to accomodate the egr system, they just weren't drilled and tapped for use. I removed the ones on my C heads because I didn't need that system and they were in the way. Anyway, if you don't need egr then use any heads you can get, preferably not Js as they had the smallest intake valves and flowed about the worst of all 455 heads. What is the 455 going into and what kind of application will the vehicle be used for?
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Dan
'46 2 door
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