Labor Day Putting down your wrenches or time for
MORE wrenching? 
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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 2007 Posts: 4,215 Moderator | | Moderator Joined: Mar 2007 Posts: 4,215 |
A friend of mine just brought home a gorgeous 1953 GMC half ton 5 window. But it's not correct in many ways. The engine casting number says 5845383. I can't find that number anywhere, it is a six cylinder, looks like a 235.
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | | | | | | Joined: Mar 2007 Posts: 4,215 Moderator | | Moderator Joined: Mar 2007 Posts: 4,215 |
Thanks Tim, the number looks more like a 6 than an 8 but I'm thinking it must be an 8. Did those engines have the 3 threaded holes on each side, thinking for motor mounts? Were those holes there before the Chevy V8?
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Wait to hear from someone else.
I am not sure when the side motor mounts started being used on Chevrolet/GMC engines.
An eight cylinder engine became available in late 1955. | | | | | Joined: Mar 2010 Posts: 10,270 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,270 | Car 235s had threaded holes on the side mounts.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Mar 2007 Posts: 4,215 Moderator | | Moderator Joined: Mar 2007 Posts: 4,215 | Car 235s had threaded holes on the side mounts. Do you mean before the SBC? In 1954? | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Is the engine a Chevy or GMC? Chevy's are about 3" shorter than GMC's so if the fan is way short of the radiator, Chevy, if about .75" short of the radiator-GMC. GMC's SN, r side, stamped on pad by starter, start with displacement, I. e. 228xxxxx, etc.
Ed
'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.
| | | | | Joined: Mar 2004 Posts: 6,212 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,212 | Chevrolet started using the side motor mounts in 1958 on the passenger cars, the trucks still used the front mounts however they did have the bolt hole boss' cast but not used. 1955 thru 1957 SBC V8's did not have the side mount boss'. I don't know when GMC switched... Mike B  | | | | | Joined: Mar 2010 Posts: 10,270 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,270 | Do you mean before the SBC? In 1954? Yes.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
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