460 Smoking upon startup
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Joined: May 2002
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From: Smithton
460 Smoking upon startup
I recently rebuilt the 460 in my 88 F250. Bored .020 and a small rv cam. Problem is it puffs smoke upon startup. Sometimes you cant even see it,but you can smell it. Other times it is a huge white cloud. The machine shop that did the heads knurled the guides and said all the valves were good so they reused them.
I even put a new set of valve seals on and it does the same thing. Any ideas are appreciated.
Thanks
I even put a new set of valve seals on and it does the same thing. Any ideas are appreciated.
Thanks
Posting Guru
Joined: Sep 1999
Posts: 2,297
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From: Indiana
460 Smoking upon startup
[updated:LAST EDITED ON 14-Nov-02 AT 00:22 AM (EST)]2WISE4AGM, Knurled guides are a band-aid for the real issue, worn valve guides.
And this is my opinion only, if they are worn, replace them. It will save problems down the road. Which usually isn't that far.
If the smoke is oil smoke, and your stem seals are new, then it could be possible your getting oil past the knurled valve guides.
And this is my opinion only, if they are worn, replace them. It will save problems down the road. Which usually isn't that far.
If the smoke is oil smoke, and your stem seals are new, then it could be possible your getting oil past the knurled valve guides.
Postmaster
Joined: Aug 2001
Posts: 2,882
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From: Nevada
460 Smoking upon startup
White smoke is coolant. Sounds like you have a leak into the intake manifold or a bad head gasket. Most common cause is not putting rtv around the water passages when installing the intake manifold. I'd suggest compression and vacuum checks.
I agree that replacing valve guides is the only way to go if you plan to run it for a long, long time, but if it's a patch or low-budget, knurled guides shouldn't be any problem.
I agree that replacing valve guides is the only way to go if you plan to run it for a long, long time, but if it's a patch or low-budget, knurled guides shouldn't be any problem.
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