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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | OK, so they don't exist. Apparently the umbrella type oil deflectors didn't appear until the 1941 head design. Has anybody used a modification to stop one of these from burning oil that leaks through the valve guides. I have seen a posting on another site that the deflectors from a Ford 302 work out fine. I don't really understand how they would fit on. | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | It is common to use umbrella seals on those early heads. They fit around the valve stem and hang down over the guide. Here is a ebay LINK to some as an example.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | Dave,
thanks, now I understand. They are real seals that sit on the guide. | | | | | Joined: Oct 2006 Posts: 1,847 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 1,847 | they cost like 68 cents apiece at napa | | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | Would they keep the valve stems too dry? | | | | | Joined: Oct 2010 Posts: 45 New Guy | | New Guy Joined: Oct 2010 Posts: 45 | The umbrella type seal is a snug fit on the valve stem and moves up and down with the valve; they don't attach to the guide, just "umbrella" the oil away from the guide bore. I don't use the seals on the exhaust valves; I figure they need lubrication and they don't suck the oil by like the intakes do. If the exhaust guide bore and valve stem are a good fit, little oil will pass.
Last edited by WillH; 01/20/2011 8:41 PM.
| | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | Thanks, I think I got it now. | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Most modern engines use what are called PC seals on the intake and exhaust. They fit tight on the valve and the guide preventing almost any oil from getting to the guide. Example You would think valve guides would need oiling but they seen to work fine with almost nothing. The advantage in PC seals are, they stop what amounts to a vacuum leak past the guides on the intakes, and prevent exhaust gasses from getting past the guides on the exhaust, and entering the engine.
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