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Mod | | | Forums66 Topics128,154 Posts1,056,850 Members48,456 | | 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!
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| | | | Joined: Jan 2008 Posts: 239 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2008 Posts: 239 | I have 3 purposes in contemplating this swap. 1) Torque. My truck earns its keep hauling stuff and towing. I'd drop in a 454 or 496 if I didn't have to move the steering box to do it. 2) Fuel Economy. I get about 20 MPG out of my 235. I expect to be able to do that with an LS easily enough. 3) Driveability. If I'm going to go away from the original 235 to a modern engine the LS series is a vast improvement over 350s etc.
Why do I want to keep my SM420? I want a truck transmission for the low gears in it. Ideally I would be able to get either a Gear Vendors or Ranger gear splitter/overdrive in addition. I could add those at any time however.
Devin
If you can't hose it out it ain't a truck
55 3100
63 Corvair Monza
64 El Camino
72 240Z
01 Suburban
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