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Click on image for the lowdown. 
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9 members (cmayna, 49choptop, fonz8261, FrankenChevy, baldeagle, Peggy M, tclederman, TexasJim50, 1 invisible),
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Mod | | | Forums66 Topics128,018 Posts1,055,341 Members48,419 | | 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: Jun 2010 Posts: 301 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 301 | Does it have hydraulic lifters? If so sounds like one is failing, not pumping up completely so the connecting rod is not firm up against the rocker arm. Explains the no rattle when cold (oil is thicker) and at higher RPM its cycling so fast your ear can't pick up the noise as well. Had it happen to me last year.
1949 Chevy 3600
1975 W-25 Hurst Olds
1970 GMC 1/2 ton Fleetside
2010 Chevy Silverado
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