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Mod | | | Forums66 Topics128,165 Posts1,056,992 Members48,458 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2011 Posts: 2,951 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 2,951 | **UPDATE**
I just finished inspecting the valve seals. ALL the red umbrella seals have failed and they were only on the exhaust valves. Looks like they were installed with the upper edge deliberately tucked inside the lower groove of the valve stem and inside the valve cap. Don't ask me how they accomplished that. Doesn't make sense to me.
I have removed the failed exhaust valve umbrella seals and installed the O-ring style.
The intake valves all have positive seals and they look fine but the builder also used the original O-ring seals inside the cap. Jerry warned me that using both seals would be a problem so I have removed the O-rings on the intake valves and now they just have positive seals.
All the valve guides were machined.
The engine runs fine and has 40 psi oil pressure. Now I must adjust the valve lash after all that work.
Photobucket album of my valve seals. The photos of the bare head are there to show what the valve guides look like if they are NOT machined. | | |
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