Which water pump do you have?
The larger paddle wheel moves more water and will fit in all “A” series engines, whether 948, 1098 or 1275. Many of our classic cars suffer overheat challenges (that’s why our aluminum Spridget radiator has been such a big success, click to learn more). But you need a good water pump, and the larger impeller can make a big difference as far as the volume of water that moves through your cooling system.
We changed a leaking water pump gasket this week on a 1275 engine equipped Bugeye and found a short impeller 948 pump present (and put in a new deep one).
We have put a lot of deep pumps into 948 engines. Occasionally, the deeper impeller will just kiss the block internally. In these installations, a slight amount of material may need to be removed from the block, so if you put a deep pump in your 948, make sure to check the fit before you bolt it all together. To buy a deep impeller pump, click here to learn more.