The Stovebolt Site Forums The Shop Area Engine Shop 261 Block ID (water pump styles)

I have two 261s, one is a late block with the new style water pump, etc and the other one is a '54 model (3703414) and it has the high mount water pump on it. I'm just learning about these engines and so far I thought all the 261s had the new style water pump. Did the early ones use the same style pump as the earlier 235s? If so, which years? Its possible this engine has an adapter plate on it for that pump but I really can't tell for sure.

Hy mechanic58, the first two years of 261 production (54-55) had the "high mount" water pump, the same water pump the 235s of the same years had, hope that helps.

The 261 high mount pump looks like a 216/235 pump but has a larger lower hose connection.

Here's some good info on 261's and water pumps.

http://www.canadianmilitarypattern.com/235%20&%20261%20Cubic%20Inch%20Modifications.htm

It is possible to use a smaller-truck water pump on any 261 (if you want to use a smaller-truck radiator).

Of course, you would have to match the year/style of the pump to the block (or use an adapter plate, if you have the 54/55st block).

Thanks for all the information.