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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: Jan 2022 Posts: 116 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 116 | How far can you you bore a 350' chevy? I see they make .060" .080" and .100" pistons.. | | | | | Joined: Feb 2004 Posts: 29,776 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,776 | Depends on the year of manufacture. Newer ones- - - - -1970 or later, are probably pushing the envelope at .060. I used to buy "worn out" 60 over race blocks and put my high school machine shop students to installing 8 sleeves as shop projects. After a while some of my competitors realized that they were getting beat by their own junk!
"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: Jan 2022 Posts: 116 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 116 | Hey there Jerry it is a 69' 4 bolt main with a Steel crank. | | | | | Joined: Feb 2004 Posts: 29,776 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,776 | That's right on the ragged edge of the "thinwall" block changeover- - - -not sure which way a 69 would be. 60 over is as far as I like to go, unless I'm building a short life engine. We would go through 2-3 engines a season on the dirt tracks- - - -with more clearance built into a brand new one than a 100K mile street engine. A round track engine with 1K miles on it was an antique! If you have a little extra piston skirt clearance on a 60 over engine, consider maybe putting a knurl on the piston skirts to get the clearance right, and do a hone and re-ring job. If there's less than .005" taper wear in the top 2 inches of the bore (and no score marks), you can do a re-ring without boring.
"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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