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Jul 21st, 2025 | | | | Joined: Oct 2013 Posts: 331 Shop Shark | | Shop Shark Joined: Oct 2013 Posts: 331 | 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.
Last edited by mechanic58; 10/29/2013 2:50 PM.
1950 4100 - unrestored and driven weekly for almost no reason at all.
| | | | | Joined: Nov 2005 Posts: 6,061 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,061 | 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. | | | | | Joined: Jan 2001 Posts: 5,320 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,320 | The 261 high mount pump looks like a 216/235 pump but has a larger lower hose connection.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Mar 2008 Posts: 1,775 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 1,775 | | | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | 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).
| | | | | Joined: Oct 2013 Posts: 331 Shop Shark | | Shop Shark Joined: Oct 2013 Posts: 331 | Thanks for all the information.
1950 4100 - unrestored and driven weekly for almost no reason at all.
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