It's a '54 (truck) block with a '56 head. Water pump is low-profile one that fits '54 block. Truck fan, as far as I know. Was in truck before rebuild.

Longer answer: it's a '54 1-ton cab/front clip sitting on '54 1/2 ton frame. Front clip has 1-ton radiator surround. Engine block is original to '54 1-ton truck, but now sitting in 1/2-ton frame. So all '54 1-ton parts, except '54 1/2 ton frame, new after market radiator (for 1-ton, 4 core), and '56 848 head. (My '45 head was cracked). Fan and water pump are from same engine that was in 1-ton.

Can someone get me a measurement from top of fan blade to top-most fin on radiator? I looked at pics of another 1-ton I had and my 2-1/2 inch measurement doesn't seem that far off.

1954 Chevy 3100
"Jagrolet
In the Stovebolt Gallery
More pix on my website
1953 f100 w/ v8
1953 f250 w/ v8