[SOLD] Small block pulleys

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just curious what is the difference between pre 1970 and after?

The pre 70 water pump pulley has more of a bell shape, the 70 and later has the "chamfer" on it....

The depth was different also for the cast iron water pump....
 
ok thanks, It wont work on my 68 318 without changing to a newer style aluminum water pump and housing then? I had read somewhere that you could do this.
 
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