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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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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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#37404 11/20/2004 6:38 AM | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | The cool Chevy motor in 1961 was the 348. You might look for one of those or maybe the 409 which didn't arrive until 1962 but looks the same.
I'm a fan of big blocks and own a couple of 454s. None of the questions you ask represent difficult issues to solve.
Bellhousing should not be a problem. Weight is more, but only a couple hundred pounds, so its not a killer issue in a truck.
I don't think the motor mounts are a problem.
The issue I would be concerned about is that SM420. They are pretty tough, but were not designed for the 500 ft lbs of torque a mild big block can put out.
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... | | |
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