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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Feb 2004 Posts: 29,749 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,749 | According to my Federal-Mogul specification book, the 248, 270, and 302 engines all share the same connecting rod and main bearing sizes.
Rod bearings: Federal-Mogul part number 1905 CP Standard shaft diameter is 2.3110" - 2.3120"
Main bearings 1954-55: 697 M 1956-63 engines: 4030 M
Main bearings have four different diameters, like 216 and 235 Chevy engines.
#1: 2.6835 - 2.6845
#2: 2.7145 - 2.7155
#3: 2.7455 - 2.7465
#4: 2.7765 - 2.7775
Earlier manufacture date 228, 248. 256, and 270 engines have the same shaft sizes, but they use different part number bearings for some reason.
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!
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