Are you comparing hydraulic lifters for both? Or hydraulics for a '54 and solid lifters for the 55-62?

I'll be watching for the answers to your question. I bought hydraulics to replace those from my '53 235. It was a full pressure with hydraulics presumably from a car with Powerglide. I now want to install them in a '61 261 which was originally drilled for hydraulics but came with solids. My engine guy says it will work.


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.