Pulley Part Numbers ??? 64 409

Old School

Old School

 
Supporting Member 1
I need help getting the right pulleys on my 64 QA 409 400HP motor. I've added power steering and looking for the correct pulleys for the fan and crank. Does anyone know the GM part numbers for the correct pulleys? I see many for sale but don't know which will marry up with the power steering pump .

I read the previous thread on pulleys and it didn't help/
Thanks - Mick
 
G

gearhead409

Well Known Member
Mick

the crank pulley is two groove and stamped 3766987. the early 64s used a two groove water pump pulley that was used with the small bearing pump, it's stamped 3770245. the big bearing pump uses pulley # 3850141, i don't know if it is stamped or not. it was used on 64 and 65 409s without a/c.
 
Old School

Old School

 
Supporting Member 1
Thanks!! Just one more question. Did the 64 HP Motor P/S pump use a 2 groove pulley? That is where I got confused. If the P/S used a two groove pulley, that would require three grooves on the crank. Then if they didn't, I'm good to go!
 
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