Posted by David on Wednesday, August 11, 2004 at 3:05AM :
In Reply to: Re: 251 block Well if thats the case....... posted by RDavis on Tuesday, August 10, 2004 at 4:57PM :
Will's question was whether there was a difference in the 251 block. The answer is yes there can be differences in the older and newer blocks but not in where or how the water pump bolts up. New Airtex water pumps currently sold at Napa are manufactured to fit both internal and external bypass motors.