Quote:

The 1969 factory service manual says on page 7-4, "When replacing the water pump do not install a standard water pump on any air conditioned vehicle or vice versa. See specifications for proper pump."

Specifications for 340:

WATER PUMP IMPELLER
Diameter-Number of Blades
Standard.................4.38"-8
A/C.........................3.50"-6





I just call techincal service for GMB in Jersey. Their listing for a '70 340 is part #120-1070. They do not have a seperate listing for standard vs A/C. 120-1070 has an 8 blade 3.62" (92mm) diameter impeller.

Has anyone here run one of these on a standard (non-ac) car that can provide some feedback?

Thanks!