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Jul 21st, 2025 | | | | Joined: Apr 2008 Posts: 136 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2008 Posts: 136 | My friend has a 57 GMC USA built truck
It looks like a 235 annd he thinks it is a 235 since Canadian built GMCs have Chevy engines.
I thought it was probabley a 270.The valve cover is scripted GMC and the rad is different.
Do 270 look the same?
Do they take the same points?
thanks | | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | The stamped number on the machined pad just behind the distributor will have the engine displacement as the first 3 digits if it's actually a GMC engine. (228, 270, 302, etc.) I believe the GMC's also have the two hold-down bolts through the center of the valve cover, like a 216 or early 235 Chevy, instead of the 4 small bolts around the perimeter that a late-model 235 has.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Apr 2008 Posts: 136 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2008 Posts: 136 | yes it has the 2 hold down bolts | | | | | Joined: Feb 2006 Posts: 1,867 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 1,867 | The GMCs were longer engines then the Chevys, so if it says GMC on the valve cover, its a GMC! | | | | | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | I'd guess that Canadian GMC said GMC on the valve cover even if they had Chevy engines. How about K'nucks? | | | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | I'd guess that Canadian GMC said GMC on the valve cover even if they had Chevy engines. How about K'nucks? And you would guess wrong! If it has the script it would be an American GMC motor, and should be a 270 for the 57 model year. The script changed over the years, as did the location of oil fill holes or breathers, but the 228 valvecovers will fit a 302 and everything in between. | | | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | The 216 with the acorn nuts never had CHEVROLET on the valve cover anyway, only the 235/261 does.
The GMC engines have 5 freeze plugs under the exhaust manifold instead of 4. The easiest way is to check the serial number, though.
Last edited by 4ontheFloor; 07/11/2008 9:45 AM.
Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic. | | | | | Joined: Apr 2008 Posts: 136 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2008 Posts: 136 | are some paerts interchangeable like points/dist and fuel pumps? | | | | | Joined: Feb 2006 Posts: 1,867 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 1,867 | are some paerts interchangeable like points/dist and fuel pumps? Yup. | | | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | Those are the only parts interchangeable. The bell housing is but the flywheels aren't.
Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic. | | |
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