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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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#51205 10/16/2005 10:02 PM | Joined: Oct 2005 Posts: 29 'Bolter | | 'Bolter Joined: Oct 2005 Posts: 29 | I have a 1954 GMC 350 dump/flatbed with original 270. The exhaust manifold fits poorly; leaks with one combined intake port on cyls 2 & 3, and out exhaust port#4 despite new gasket & retorque @ 20ft-lbs middle studs and 30ft-lbs on outer studs. Is the manifold or head warped?
In the same vein, I have access to a rebuilt Chev 292 which is in near perfect shape, and with much less worn 4sp transmission. How hard would it be to fit this engine in the old GMC?
Thanks! | | |
#51206 10/16/2005 10:45 PM | Joined: Apr 2002 Posts: 1,571 Shop Shark | | Shop Shark Joined: Apr 2002 Posts: 1,571 | Not particularly easy. The side motor mounts are the biggest challenge and I think you'd find a fair bit of other tinkering. Take your manifolds off (bolted together), and have them planed at a machine shop. The GMC 270 is a good motor, I'd stick with it if the manifold is the only problem...even though the 292 is also a very good motor.
Are you sure it's a 270? The standard engine was a 248, I'm not sure if the 270 was available in the 2-ton line. | | |
#51207 10/17/2005 3:44 AM | Joined: Oct 2005 Posts: 29 'Bolter | | 'Bolter Joined: Oct 2005 Posts: 29 | Yeah, I found the bore-stroke dimensions plate on the side of the block and it's a 270. When I rebuilt it I had to fabricate some exhaust valves and completely redid the head. It ran like a clock for a while then sprang this manifold leak that Ihaven't been able to fix. I'll try milling the manifolds - Thanks! | | |
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