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  #1  
Old 14th August 2018
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Default To seal or not to seal!

Ok. I made a comment on a Tatro video. He is rebuilding I think a 72 Ironhead. Looks and says ok, it has valve seals, that's a good thing. I said my 85 does not have valve seals from the factory. He said he uses them anyway. Even on a 36 knuckle. Said don't use Harley junk. So, when I do the heads over this winter should I put in valve seals? I mean it doesn't smoke now with no seals.
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Old 14th August 2018
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Personally I'd use seals if they're available. I can't see why not nor have I experienced any issues using them.
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Old 14th August 2018
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I'm a do-it-like-the-factory-did kind of guy. No seals here. No issues. I realize times and technology change, but on an IH motor, I think it's a solution to a non-problem. I see more complaints about seals and stuck valves, than no seals and oil consumption or smoking.
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Old 14th August 2018
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close to 180k and no stem seals has graced it. depending on what you use, might have to machine the guides to accept them. rubber umbrella seals=shinola.
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Old 14th August 2018
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If you find you must add valve seals, don’t put them on the exhausts - it’s asking for trouble.
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I dont know. Its weird. Didnt have them. Sounds like a lubrication problem in the making to me!
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Old 15th August 2018
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Do not use valve stem seals on your IronHead engine. This has been discussed here many times over the past decade that I have been here. I have a personal bad experience with valve seals installed at a machine shop against my instructions.

If you insist you may use them on the intake side. Do not use them on the exhaust side - it needs that bit of extra lube otherwise they will stick.
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Quote:
Originally Posted by IronMick View Post
Do not use valve stem seals on your IronHead engine. This has been discussed here many times over the past decade that I have been here. I have a personal bad experience with valve seals installed at a machine shop against my instructions.

If you insist you may use them on the intake side. Do not use them on the exhaust side - it needs that bit of extra lube otherwise they will stick.
That needs a repeat.
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Got it. Puzzles me as this guy seems to really know his shit about Harleys. I have watched oodles of his videos. Maybe he only puts them on the intakes. 100 miles ago I had a valve stick, its not fun and pretty scary!
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Old 15th August 2018
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you might get away with it if you use silicon/bronze. i have used them but found no adv over the iron guides and surprisingly, a lot of valve makers recommend iron guides. i run v&v stainless and although i could use the bronze, they suggested iron.
if you look at the exh rocker, you will see a oil jet hole for added oil cooling to the exh stem. even with the added oil, not a problem with they way hd designed it. as far as the intake, think of it as an inverse oiler, great for reducing upper wear. anywho, hd does not consider it a warranty issue til it crosses 500mi/qt. mine was religious at 1000mi/qt and that was running hard, i could get it near 1500mi/qt just tooling around.
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