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.
