The Ford Barn

metro1 · 11-04-2023, 02:44 PM

Got my heads back today. Inverted them on the bench with spark plugs installed and filled chambers with paint thinner. After about 5 min. there was seepage from most of the valves. After about 30 min. there was still liquid covering the valves so the leak isn't too bad. Should there be any leakage at all or will they seat better in service. I don't see any sign that the valves were lapped.

cadillac512 · 11-04-2023, 04:39 PM

Any leakage that takes several minutes to notice is no problem. Your valves are sealing just fine, and may even seal a bit better after starting the engine since any dust particles on the seats will be gone then. What you see is normal for valve sealing.

Terry

metro1 · 11-04-2023, 04:55 PM

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Thanks. That's good to know. Had me worried.

11-04-2023, 02:44 PM	#1
metro1 Senior Member Join Date: Mar 2022 Location: Richmond,Virginia Posts: 136	Post machine shop head check Got my heads back today. Inverted them on the bench with spark plugs installed and filled chambers with paint thinner. After about 5 min. there was seepage from most of the valves. After about 30 min. there was still liquid covering the valves so the leak isn't too bad. Should there be any leakage at all or will they seat better in service. I don't see any sign that the valves were lapped.

11-04-2023, 04:39 PM	#2
cadillac512 Senior Member Join Date: Apr 2019 Location: Kansas Posts: 1,001	Re: Post machine shop head check Any leakage that takes several minutes to notice is no problem. Your valves are sealing just fine, and may even seal a bit better after starting the engine since any dust particles on the seats will be gone then. What you see is normal for valve sealing. Terry __________________ "It don't take but country smarts to solve the problem" (Smokey Yunick) '41 Merc Town Sedan / 260" 8CM engine '66 Fairlane four door / "warmed up" 302

11-04-2023, 04:55 PM	#3
metro1 Senior Member Join Date: Mar 2022 Location: Richmond,Virginia Posts: 136	Re: Post machine shop head check Sponsored Links (Register now to hide all advertisements) Thanks. That's good to know. Had me worried.