3U crankshaft?
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From: Oregon
3U crankshaft?
I picked up a '72 F150 awhile back and found that after it had sat for awhile and I drove it, oil leaks developed(I know, what a shocker). I replaced the pan gasket and while the pan was off, checked out the crank. The engine was s'posed to be a 390 that was put into the 4x4(yeah, right), and if I remember correctly, the 390 crank is a 2U, so what is a 3U? 352/360 crank? The other question, what's the best way to stop the oil dipstick tube from leaking out the side of the pan, is there a handy way to drill the rivets out and replace the gasket the factory put in? Thanks y'all in advance 
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From: Oregon
Oh...that makes me perplexed then. I guess somebody made one engine from 2 'cause it's got C8AE-H heads on it. Haven't yanked them to look for hardened seats though, too much trouble to simply satisfy curiosity. Thanks much Mike!
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From: Oregon
On somethin as old as this one, probably. With my '69 F250 with the 360 when I tore it down, it was the first time the heads had been removed from the engine. The exhaust valves were pretty sunk into the heads, showing that they weren't hardened seats. On engines that are this old, with as many miles are usually on these FE's, it would normally be obvious, I think. I'm sure somebody will correct me if I'm wrong, and I'm sure there are exceptions...an engine rebuilt with only 30,000 miles cause the owner wanted to soup it up or somethin of the like.
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Joined: Nov 2002
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From: Littleton, CO
A hardened seat is more or less a steel ring installed in the head. You should be able to detect a distinctive ridging where the seat has been installed, as opposed to the valve sitting directly on the head. Definitely not a stock motor to the 72 with C8 heads. Tough to say if they have the seats without pulling them off.
--Mike
--Mike
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