Consider a frost plug heater in the block under the manifold. I have taken my '48 (with '61 261) to work as low as 20 below with 4 hrs of heating on a timer. When it got that cold, I would also put a magnetic heater on the oil pan all night.

You won't need to go to that extreme but mine would run great after just 4 hrs of heating.

Last edited by Wally / Montana; 05/16/2025 3:24 PM.

1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.