Here's some more details. They are completely stock. No Porting, no polishing. They do have minor surface rusting. The onlything not original is the springs. The only work that has been performed on these heads is minor surfacing (once) and do not require any additional surfacing. Both heads have the correct 3964291 castings, with date codes of 61269 & D1370. As I said before, the date codes are off for a match, but they are both 3964291 - with the ?Yenko? 2.19" intake and 1.72" exhaust.
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