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Mod | | | Forums66 Topics128,030 Posts1,055,428 Members48,422 | | 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!
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| | | | Joined: Jul 2002 Posts: 17 Junior Member | | Junior Member Joined: Jul 2002 Posts: 17 | Could someone please tell me the stock bore for a 261 thanks 48nick
48 nick
| | | | | Joined: Jan 2000 Posts: 125 'Bolter | | 'Bolter Joined: Jan 2000 Posts: 125 | I know it is 3/4, I'm thinking 3 and 3/4.
Grant
1950 Chevy 3100
1952 GMC 150 (In Pieces)
1968 Chevy K20
1966 Shovelhead
1978 BMW 100S
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | That's right. Bore is 3-3/4" for 261 (3-9/16" for 235) and stroke is 3-15/16" (for 235 & 261).
Tim | | | | | Joined: Jul 2002 Posts: 17 Junior Member | | Junior Member Joined: Jul 2002 Posts: 17 | Thanks folks that helps I should find a manual or something
48 nick
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