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Click on image for the lowdown. 
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| | | Forums66 Topics128,023 Posts1,055,367 Members48,420 | | 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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on the Internet for over 30 years! and not clogged down with Ads! Again, thanks! | | | | Joined: Mar 2005 Posts: 1,636 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 1,636 | Possibly a little bit of sludge is blocking the oil hole to a lifter. At idle it may be able to get enough oil to stay pumped up, but running down the road it may not have enough oil flow to the lifter to keep up with the work it is doing. Kinda like the restricted water lines in my house from 60 years of use. You can flush the toilet, or wash dishes, or use the washing machine, but not any two at the same time.
May have to clean the lifters or any sludge built up in the engine. Someone else should be able to shed more light on your issues. | | |
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