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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 2005 Posts: 209 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 209 | Just bought a 51 3100 w/ a 235. It seems to be OK, but I was wondering if a 250 would be an easy drop in. I'm just checking my options. This truck will have to earn its keep, and I like the simplicity of the old straight sixes. I'll probably drive yall crazy once I get this truck home tomorrow, so please be patient. John | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | It is not an easy drop in. It takes quite a bit of modification. I do like the 250 though. It takes a lot of weight off the front end. It is a good strong dependable engine. If the 235 is good I would leave it alone. If you need a replacement then consider a 250.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Mar 2005 Posts: 209 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 209 | Thanks. I plan to keep the 235, but I was just thinking about options, since I plan to keep this truck and I thought a 250 might be easier/cheaper to find to rebuild if that becomes necessary. I may just watch for a 235 to put on the shelf. Naturally, I'll have a way better idea of whats needed when I get this truck home, but right now I'm like a 3year old waiting for Santa! | | | | | Joined: Dec 2000 Posts: 3,399 Gas Pumper | | Gas Pumper Joined: Dec 2000 Posts: 3,399 | The 235 has really stood the test of time. So keep your 235 and then put a 261 on the shelf. Same footprint, almost same engine, with just a bit more horsepower and no problems. These engines last forever. Was the 250 known for the same longevity? I don't know.? | | | | | Joined: Jun 2010 Posts: 301 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 301 | Like the others said....the 235 is rock solid. If you want a few more cube's you could have the 235 bored larger then you won't have to do alot of work to fit a 250 in it. Or find a 261.
1949 Chevy 3600
1975 W-25 Hurst Olds
1970 GMC 1/2 ton Fleetside
2010 Chevy Silverado
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | I love 235's but a 250 is a much better engine in my opinion, with seven main bearings and individual rocker pivots.
That said, it is way too much work to mount one in a 51 PU.
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