Trying to accumulate parts to install AC on my 67. My engine is a 70 model with alternator bracket and PS bracket from a 70. My water pump is the 5.125" and I'm going to add a 1/2" spacer to make it 5.625". Is this the correct crank pulley from PartsPlace that I need. I hate to buy the wrong parts from them.
1970 Oldsmobile Cutlass/442/F85 3 GROOVE CRANK PULLEY WITH A/C (350, 400, & 455 AS WELL AS W30, W31 & HURST OLDS) HEIGHT/DEPTH 3” DIA 7 1/2" GM 399405 KC | Oldsmobile Cutlass/442/F85 Parts | EN12331T | 399405 KC (thepartsplaceinc.com)

 

I would strongly suggest that you get the correct 1967 brackets and pulleys. If you have your heart set on using what you have, then at least get a correct 5.6" water pump. The whole point of the longer pump is to increase the "wheelbase" between the bearings to handle the belt side load. Putting a spacer between the pump hub and the pulley increases the load on the bearings. Think of it as putting in wheel spacers.

 

I hear what you are saying but I have a brand new Flowcooler pump that I waited 3 months to get. Plus the 70 brackets are already on my car with alternator and powering steering in place. I would hope the pump has enough muscle to handle a 1/2" spacer. I do value your suggestion though.
Does the KC crank pulley and KK water pump pulley sound right to you?