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Click on image for the lowdown. 
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| | | Forums66 Topics128,072 Posts1,055,906 Members48,429 | | 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
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on the Internet for over 30 years! and not clogged down with Ads! Again, thanks! | | | | Joined: Feb 2004 Posts: 29,777 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,777 | You're running right at the upper limit of what I'd consider to be acceptable for a new assembly. I prefer clearances in the .0015"-.002" range if possible. You might want to consider going to a slightly thicker oil, maybe a 15W-40, to give a little more cushioning effect between the bearings and the crankshaft. Try at least one oil change using a straight 30 weight oil like Rotella to see if the noise changes or goes away altogether. Unless you're way north in California, running 15-40 or 20-50 shouldn't cause any sluggish cold starts like could happen up in the great frozen yankee reservation. 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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