Had to replace the water pump in my 69. I did the back plate to pump mod. which turn out to be the best mod for these cars. The car came with a three row rad. from the po. I guess he was trying to do something about the high temp. which I think wouldn't even be need but I guess it helped. I ran the car for a while and it didn't even hit the half mark on the gauge. Now I can start to look at trying to add a few more degrees in the timing an see how it runs. It may work or it may not work, lets just see.
It doesn't fix leaking BTW. But if you have it off, do this. I agree it's the #1 best thing that can be done to improve efficiency of the cooling system.
Keep in mind the link above is showing 1969 setup. Those with 67/68 8-bolt pumps will find things a little different in there...but same concept applies as they have similar divider plate.
Those with 69's and 11 bolt setups should replace water pump sleeves while you're in there too. Often skipped and many re-use the sleeves, and this is a mistake as they also impact cooling flow efficiency after the rubber ends harden and start to degrade with age. They are still available new from GM, as for part #9796347 for a pair. Roughly $20 and always on Ebay too.
67/68 8-bolt setups don't have these sleeves, so don't worry about them.
For both setups cast impeller pumps are far superior to stamped impeller pumps. NAPA sells inexpensive high quality cast impeller pumps made by Gates: TFW 43122 for 8 bolt (67/68) about $72 TFW 43102 for 11 bolt (69) about $38
2 gaskets included, brand new lifetime warranty...not remans. Over-the-counter at any NAPA in the country. No need to spend silly money on "high flow" aftermarket performance brands, or pay 200% markup to repro houses, etc.
Obviously this is all V8. I know nothing about the OHC's.
I work over at ej hospital, custom cruisers is having their benefit car show over at clearview shopping center Saturday, may have about 200 car there. I'll be over there with my car.
For both setups cast impeller pumps are far superior to stamped impeller pumps. NAPA sells inexpensive high quality cast impeller pumps made by Gates: TFW 43122 for 8 bolt (67/68) about $72 TFW 43102 for 11 bolt (69) about $38
2 gaskets included, brand new lifetime warranty...not remans. Over-the-counter at any NAPA in the country. No need to spend silly money on "high flow" aftermarket performance brands, or pay 200% markup to repro houses, etc.
Obviously this is all V8. I know nothing about the OHC's.
X2 They are good pumps Napa always takes good care of me with all my pontiac needs
