| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,181 Posts1,057,174 Members48,465 | | 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!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | 
#60247 05/09/2006 12:22 AM | Joined: Apr 2006 Posts: 19 Junior Member | | Junior Member Joined: Apr 2006 Posts: 19 | i recently purchased a 52 chevy 1/2 ton chassis that came with a 270 gmc jimmy engine with a 3 on the tree tranny. can anyone tell me the difference between the 235 engine and the 270 gmc? the 270 came with an alternator does this mean it is converted to 12 volt. should i keep the 270 or replace it with a 1950 235 with a 4 speed that came off of my 3/4 ton chevy. do you know if fenton headers fit? please help me | | |
#60248 05/09/2006 1:37 AM | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | The GMC is a better motor than the Chevy. Better iron and full pressure oil. The motor from the '50 is probably a splash oiling 216.
But you should run the Chevy motor and ship that GMC to me.
Unless you care about being original you will probably be happier with that 270. I run one in my '55 1st Suburban and love it. I certainly would not take a GMC out to put a Chevy it!
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble... | | |
#60249 05/09/2006 2:01 AM | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | Patrick makes fenton headers for the gmc and there are other headers out there for that engine. It seems as if all the hard work has been done for you. Installing a gmc engine in a chevy usually includes relocating the radiator a little bit forward. The gmc is between 1 and 1 1/2 inches longer than the chevy. There are other performance products available for the gmc engines such as four barrel intakes, dual and tripple carb intakes, even a 5 two barrel intake.
The 270 is a bulletproof engine that will go a very long time. Factory specs rate it at 130 hp. With careful consideration, and standard hot rodding techniques, it would not be difficult to get 190 - 200 hp out of that engine!
The jimmy engines were looked at in the early 50s as an ideal hotrod engine. Many jimmy power cars were record holders on the 1/4 mile track, and on the salt flats. Cars powered by a built Jimmy engine would blow the Ferds off the line in the 1/5 and 1/4 mile tracks | | |
#60250 05/09/2006 6:02 AM | Joined: Apr 2006 Posts: 19 Junior Member | | Junior Member Joined: Apr 2006 Posts: 19 | is the 270 jimmy engine a full pressure oiling system or splashing oil system like the one on my 235 chevy. or how can i find out. i beleive the 270 is from a 52 gmc jimmy. please help me | | |
#60251 05/09/2006 7:19 AM | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | the gmc family of engines (228, 248, 270, 302)are all full oil pressure engines. they use insert bearings. There is an engine number stamped on the flat spot just behind the distributer. The first 3 numbers tell you the displacement. If the engine was from a 1/2 to 1 ton pickup, it is probably a 248. If it was from a larger truck it is probably a 270. | | |
|
|
| |
