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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: Jul 2013 Posts: 46 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2013 Posts: 46 | My machine shop has just informed me that my block has to be cut to 60 over to remove all old ware and taper. Should I be concerned driving a 60 over block daily...will it cool ok...any other concerns .. | | | | | Joined: Jan 2001 Posts: 1,424 ODSS President | | ODSS President Joined: Jan 2001 Posts: 1,424 | My '56 is '30 over', ~95k miles, daily driver, only vehicle. I'd go with the water pump relocation plate and call her 'done'. No other concerns.
~ Cosmo
1949 Chevy Half Ton
Rocinante, like Don Quixote, he is awkward, past his prime, and engaged in a task beyond his capacities.
"...my good horse Rocinante, mine eternal and inseparable companion in all my journeys and courses." ...Don Quixote, Cervantes
"If you come to a fork in the road, take it."...Yogi Berra
"Rudeness is the weak man's imitation of strength." ...Eric Hoffer
| | | | | Joined: Jan 2015 Posts: 914 'Bolter | | 'Bolter Joined: Jan 2015 Posts: 914 | You could have them re-sleeve the cylinder to the original bore.
Or go with an increase in displacement and let them bore it. I do not know what the maximum oversize bore is for your engine. You should find that out before you do anything.
Also does your engine have cast iron pistons?
Think about seeing if they have new aluminum replacement pistons. Less reciprocating mass. | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | .060" is no problem,.080" is even okay in most cases.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Feb 2004 Posts: 29,818 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,818 |
There are quite a few 216's running 235 pistons- - - -a .0625" overbore, with no issues. Engines bored .080" oversize or larger tend to have short piston ring life and/or overheating problems, but 60 over is no problem. There's a LOT of cast iron in a stovebolt cylinder wall!
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!
| | | | | Joined: Dec 2000 Posts: 3,399 Gas Pumper | | Gas Pumper Joined: Dec 2000 Posts: 3,399 | No concerns whatsoever. The water pump adapter is a good idea, other than that, they run exactly the same. Pistons are larger diameter, thus so are the rings, but tolerances between it all is the same, so no worries. Once you get over .080, it's either time to start thinking sleeves or a replacement block. The replacement pistons are aluminum. | | |
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