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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: Jun 2010 Posts: 301 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 301 | Question on what's acceptable cylinder wear for bore, taper, and out of round that you all go with?
1949 Chevy 3600
1975 W-25 Hurst Olds
1970 GMC 1/2 ton Fleetside
2010 Chevy Silverado
| | | | | Joined: Feb 2004 Posts: 29,777 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,777 | If a cylinder has over .005" taper wear, or the same amount of out-of-round, it's time to rebore. The problem is that the taper wear is not linear - - - -it happens in about the top 1 1/2" of piston travel, and the rings aren't able to flex fast enough to maintain a seal on the cylinder walls. At 2000 RPM, a ring has to expand and contract 66 times a second to stay in contact with a tapered bore. Metal fatigue sets in, and the rings lose their tension and quit sealing in a very short time. A straight-wall overbored cylinder that's properly honed for quick ring seating eliminates the ring flex.
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!
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