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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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#38860 10/06/2003 4:03 AM | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | I would like everyones thoughts on valve seals.
I have seen many 4,6,& 8 cylinder chevy engines with stock "o" ring style valve seals that do not use any oil.
I have seen many umbrella seals that have cracked over time and use oil and p/c seals that have led to oil starved valve seizing.
I am wondering why anyone would use anything but the stock “o” ring style seals on chevs. If installed correctly they seldom fail.
Thanks, Dave
See the USA in your vintage Chevrolet! My Blog | | |
#38861 10/06/2003 8:45 AM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | Isn't it possible to use both types of seals simultaneously?
Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic. | | |
#38862 10/06/2003 12:43 PM | Joined: Jan 2000 Posts: 1,586 Extreme Gabster | | Extreme Gabster Joined: Jan 2000 Posts: 1,586 | Dave, I use both the stock O ring seals and unbrella seals on 2-261's and a 235 I rebuilt in my trucks.These engines have been running for years with no problems amd no oil useage.Maybe the stock o rings were fine,maybe not. | | |
#38863 10/06/2003 9:28 PM | Joined: Jul 2000 Posts: 962 Shop Shark | | Shop Shark Joined: Jul 2000 Posts: 962 | The O ring seals do little or nothing about running oil consumption. I just had to install the umbrellas on my fresh 235 to stop the motor from sucking oil past the guides. And the valves and guides are fairly new, only about 12K miles on them. But I have heard of the plastic seals causing oil starvation...
your results may vary.
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