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FE Technical Forum / Re: 1970 f250 390 build
« on: May 07, 2024, 02:29:18 PM »I discovered that the pin in one of the roller lifters had worked it's way loose and the wheel is chewed up. The corresponding lobe on the cam has a pretty good ridge in it. One of the burned pushrods corresponds to that lifter, not sure if they're related.
I'm not used to looking at cylinder heads. They're C8-AEH castings. They were advertised as being worked over and have hardened seats, bowl work, with matched cc chambers. I can see that they have double springs (or helper springs?), one piece retainers, viton valve seals. The bowls appear to have work done, there's casting flash in the intake runners. The valves are ~2.058" intake and 1.056"ex., 0.368" diameter.
Is there a good resource for FE heads with pictures and so forth to review in order to better evaluate what I'm looking at?
None of the dimensions, that I high lighted in bold, are FE dimensions. Valves should be ~2.03 x 1.56, with ~.371 to .372 stems
I think we need pictures of your heads and rocker arm assemblys. The RA shaft grooves go to the bottom or the rockers can't get full oil.
You should be able to blow the restricter out with air, from the bottom of the head.