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Re: [oletrucks] 55 GMC 150 motor?

To: "jack halton" <safesix@worldnet.att.net>, "Keith Breuer" <kbreuer@sgi.net>,
Subject: Re: [oletrucks] 55 GMC 150 motor?
From: "Blaine & Maggie Dumkee" <bmdumkee@auroranet.nt.ca>
Date: Thu, 4 Nov 1999 12:34:56 -0700
Quick question on GMC engines. Both my 59 GMC driver and 59 GMC parts truck
have 235's. They appear to be the original engines. Both are Canadian
models, did that make a difference?

Blaine Dumkee
59 GMC 9314
Fort Smith NT

-----Original Message-----
From: jack halton <safesix@worldnet.att.net>
To: Keith Breuer <kbreuer@sgi.net>; oletrucks@autox.team.net
Date: Thursday, November 04, 1999 4:43 AM
Subject: Re: [oletrucks] 55 GMC 150 motor?

>Although Chevy and GMC shared chassis and bodies, GMC's used a different
>family of engines through the 50's and most of the 60's. Generally larger
>physically, with thicker castings, bigger bearing surfaces in some areas,
>always full pressure crank oiling systems. They were designed as truck
>engines, never offered in any GM car,  and were considered by some to be
>superior to the "Stovebolt". Actually all GMC inlines have solid lifters,
>there is no oiling provision for hydraulic lifters. GMC's typically had
>stronger internals, like higher volume oil pumps and alloy timing gear
>rather than the fiber gears on 235's. The "Jimmys" were made in
>displacements of 228, 248, 270 and 302 cubic inches and share many internal
>parts, were widely used in military vehicles, and were also very popular
>racing conversions, due to their prodigious torque and rugged bottom end
>design. When raced in sprint cars, they became known as "the farmer's
>These engines were never produced in the volume of 235's, so parts can be
>more difficult to locate, and sometimes more costly. Some 235 parts like
>water pumps and distributors are the same, although they may carry
>part numbers. GMC radiators are different from Chevy, but bell housings and
>drivetrains were identical.
>If your 55 motor (probably a 248 - first 3 digits of the engine number are
>the displacement - look on the block to rear of distributor) is running
>well, there's no reason to replace it with a 235. It would lower the value
>of the truck and require modifying the front crossmember for the shorter
>Jack / Winter Park FL
>----- Original Message -----
>From: Keith Breuer <kbreuer@sgi.net>
>To: <oletrucks@autox.team.net>
>Sent: Wednesday, November 03, 1999 10:40 PM
>Subject: Re: [oletrucks] 55 GMC 150 motor?
>> > Another dumb question: I just got my "new" GMC 55-1
>> > running, but was surprised to discover it is not a 235
>> > motor. I already have had to special order a valve
>> > cover gasket, and am wondering if a 235 would be
>> > better. What motor should be in this truck? How does
>> > it compare to the 235?
>> The only dumb question is the one not asked.... But you might get
>> some dumb answers!
>> The 55-1 came standard with the GMC 248. It offered a little more
>> horsepower than the Chevy 235 and hydraulic lifters. I believe the
>> over all length of the Jimmy engine is longer than that of the Chevy
>> also.
>> Keith Breuer
>> kbreuer@sgi.net
>> ---------------------------------
>> My 1947 3/4 ton Chevy Web Site
>> http://www3.cybercities.com/k/kbreuer/
>> ---------------------------------
>> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959

oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959

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