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1954 GMC 302 crankshaft specs #1602820 04/29/2026 9:17 PM
Joined: Mar 2026 Posts: 70 Lillooet BC D Dave1234 'Bolter
Dave1234 'Bolter D Joined: Mar 2026 Posts: 70 Lillooet BC	What are main and rod bearing journal diameters? Last edited by Gdads51; 04/30/2026 3:16 AM. Reason: add detail to title

Re: 1954 GMC 302 crankshaft specs Dave1234 #1602832 04/30/2026 3:06 AM
Joined: Jan 2022 Posts: 2,481 Morris Ranch Texas B Bill Hanlon 'Bolter
Bill Hanlon 'Bolter B Joined: Jan 2022 Posts: 2,481 Morris Ranch Texas	I don't have '54 302 specs. First attachment is from '52 GMC Maintenance Manual. Second is from '57. Attachments Clipboard01.jpg (22.74 KB, 39 downloads) Clipboard02.jpg (30.53 KB, 39 downloads) '52 '57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.

Re: 1954 GMC 302 crankshaft specs Dave1234 #1602835 04/30/2026 3:47 AM
Joined: Feb 2004 Posts: 29,851 Dellrose, TN H Hotrod Lincoln Kettle Custodian (pot stirrer)
Hotrod Lincoln Kettle Custodian (pot stirrer) H Joined: Feb 2004 Posts: 29,851 Dellrose, TN	Originally Posted by Dave1234 What are main and rod bearing journal diameters? 248, 270, and 302 all run the same rod and main bearings, and journal diameters: Connecting rods: Federal-Mogul #1905CP Standard diameter 2.3110-2.3120 Main bearing set #679M- - - -1954-55 engines bearing #1: F-M #9846CP std. shaft diameter 2.6835-2.6845 bearing #2: F-M #9847CP std. shaft diameter 2.7145-2.7155 beating #3: F-M #9848CP std. shaft diameter 2.7455-2.7465 ( Flanged thrust bearing) bearing#4: F-M #1909CP std. shaft diameter 2.7765-2.7775 Main bearing set #4030M- - - - -1956-63 engines Same crankshaft dimensions as above. #3 main bearing is F-M #1908CP No difference in the other bearings or dimensions. Information from Federal-Mogul shop specifications book #115- - - -1982 edition. 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!

Re: 1954 GMC 302 crankshaft specs Dave1234 #1602861 04/30/2026 5:05 PM
Joined: Mar 2026 Posts: 70 Lillooet BC D Dave1234 'Bolter
Dave1234 'Bolter D Joined: Mar 2026 Posts: 70 Lillooet BC	Thanks fellas, appreciate it

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