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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: Mar 2026 Posts: 74 'Bolter | | 'Bolter Joined: Mar 2026 Posts: 74 | Question, can a 302 block accept a 4.0 sleeve with a 1/8” wall thickness, this will require the cylinder to bored out to 4.253” any concern with exposing the coolant passage? | | | | | Joined: Mar 2026 Posts: 74 'Bolter | | 'Bolter Joined: Mar 2026 Posts: 74 | I guess this the wrong forum for these technical questions ,maybe I should post on the inliners forum.
Last edited by Dave1234; 10/26/2026 8:16 PM.
| | | | | Joined: Jul 2018 Posts: 282 'Bolter | | 'Bolter Joined: Jul 2018 Posts: 282 | Dave, boring that much sounds scary, to ignorant me.
Maybe our experts are still mulling this over.😳
What is the reason you are sleeving this 302?
~Charley 1954 Chevy 3100 with 235“Bud”Follow along in the DITY1963 Chevy half ton stepside short box 230 1954 GMC 3 ton 302 And several more Chevy camper and work trucks 1979 1987 1996 | | | | | Joined: Feb 2004 Posts: 29,889 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,889 | The only time I use a 1/8" wall sleeve is if there's a hole in the cylinder wall. Yes, a 302 will probably handle a sleeve that thick, but a 3/32" wall sleeve will accomplish the same fix with less material being removed from the block. That only requires boring the block to 4 3/16". I usually bore for about a .001" press fit when installing sleeves and cold soak the sleeve in dry ice and alcohol before installing it. I've been doing it that way for a little over 40 years.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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