I have two spare J4's, depends what state/condition you want them in....
The JP4 had bigger valves, If i remember right. Yet milder cams. I think the inlet manifold was also different, not in a good way.
I'm scratching my head, but a hybrid of the JP4 with J4 cams & inlet was a slightly worthy upgrade in the day. Although I think the inlet manifold needed to be re-drilled to the head.
Depends on what you building I guess, which one suits budget/application/quality etc.
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