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#1
03-10-2014, 02:16 PM
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Question on Viton valve stem seal?
I believe that the valve stem seals in my heads are showing some wear.
Slight oil buildup on back of intake valves and occasional puff at startup. So got the valve compressor and dug in and was surprised both intake and exhaust valves has an oil shield. Pulled one from an intake valve and took some measurements. Valve Guides are already machined to .530 and have standard valves .340 with two grooves. Valves feel snug when trying to wiggle any direction. Would like to know what seal you would recommend and where to purchase. I like the Positive Type Seal with the Metal Shell and spring on top. Need to replace all 16. Thanks Gerry
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1968 Firebird 400, 068 cam, TH400 & 13" Continental Converter, Auburn posi with 3:08 factory gears, Cliff's Q-jet resting on a 68 factory iron intake, DUI HEI and Ram Air pans and RARE Long Branch Manifolds |
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#2
03-10-2014, 03:39 PM
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I had positive seals on mine and they were too tight. as a small amount of oil needs to ride between the guide and stem. i ended up putting the orings back on and reinstalling the oil shields on the springs.
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It's hard to soar like an eagle, when you're surrounded by turkeys! My wife says she'd llike my car a lot more if it wasn't mine.   64 Grand Prix 389 .030, 1.65 Scorpion Rollers, Tripower, RARE Long Branch, Custom Stainless Exhaust and mufflers, 3.90 posi 200-4R. 068 cam. |
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#3
03-11-2014, 02:46 AM
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I prefer the seal you have pictured, and go with those if the inner spring size allows it. These are more forgiving and seem to conform better. I just did a set of 670 heads that someone in the past cut the guides down to .527 and the steel shell seals would slide on loose. I went with a set of .500" non-sided seals and they went on like they were made for the guide.
I just order mine out from Summit.
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress. |
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