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Old 10-26-2005, 02:47 PM
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Can intake side of heads be milled?

1969 351w
pro topline aluminum 215cc heads


Originally my motor ran great, then slowly started running bad over time, after checking rockers, plugs, carb , timing and everything I found that some on the intake bolts were loose. So I tighten them back to 20ftpds and it would run fine for a few days then act up again. Eventually it stripped the bolts out of the head, but only from one side, which seemed weird. Fords use 5/16 intake bolts so instead of helicoils i just drilled and tapped out to 3/8 inch and ran studs. Put it back together and after a few days started running bad again, i was sure it wasnt the intake since the top wasnt leaking so went through checking everything else with no luck. With no more options I pulled the intake again and discovered the thing was leaking from the under side. Put in new gaskets and over torqued it down to 30 ftpd's.... runs like a top now with no problems. Seems to me the heads were milled at the wrong angle or a few degree's off, what do you guys think? I'm not sure if a machine shop can mill that side of the head since they have a ridge that the valvecover sits on. Maybe the intake could be milled to adjust for the heads being wrong.

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Old 10-26-2005, 03:31 PM
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Yes, they can be milled on the intake side. You can use an end mill or a shell mill cutter. The hard part is determining the exact amount needed and you have to remember that the heads will be one-off afterward.

tom
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