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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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| | | | Joined: Jan 2009 Posts: 101 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2009 Posts: 101 | I have a 60 235 ci with original hydra-matic in my 54 pick up. Good oil pressure and tuned recently. When I run it at 55 mph for about ten minutes I begin to hear a loud "clacking" noise. Sounds like lifters or valves. Not a knock. When I slow down, the noise disappears within a minute. Any ideas on what this could be? Thanks in advance.
Disciple
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