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Join Date: Jan 2005
Location: 2 Dog Town in West Texas
Re: SBC 350 valve guide seals - what size, modified heads?
If the seal shown is new, it should be pressed down on to the guide boss. That seal looks like it is expandable. Take a 1/2 socket and see if you can force it down.
These are the standard PC seals and any other seal with the same dimensions will work. They do require a special push on tool and remover but sometimes the back yard mechanic can do it in a crude way. I still have my original tool in my tool box.
If you are still confused and can't find the correct seal, either put the stock style O ring on the valve stem grove, the second one and be done with it.
The other thing you can do , is get the Ford type seal "umberella" to fit that valve and inside your spring. The O ring is cheap as well as the Ford seal.
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968
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Last edited by zdld17; Sep 15th, 16 at 03:19 PM.