| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | All small block GMC 6 cyl. engines are longer than Chevys, until the ‘63 194, 230, 250, 292 engines came out.
GMC engines start the SN with the displacement, I. e. 228xxxx, right side, stamped on machined pad behind the distributor.
Ed
Last edited by EdPruss; 04/19/2021 3:31 AM.
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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