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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Feb 2004 Posts: 29,755 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,755 | You have a check valve in one of the hydraulic lifters failing to seat properly, probably due to a buildup of varnish inside the lifter. Add about a quart of kerosene or Diesel fuel to the crankcase and run the engine at a fast idle (1200-1500 RPM) for 15 to 20 minutes.
DO NOT DRIVE THE CAR OR PUT ANY LOAD ON THE ENGINE!
After 15-20 minutes, drain the crankcase while the oil is hot, and change the oil filter. Refill the engine with 15W-40 oil. I'll bet the rattle goes away.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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