Posted by docmirror on January 26, 2019 at 14:07:02 from (107.213.165.255):
In Reply to: ot, old chevy experts posted by ericlb on January 26, 2019 at 11:03:54:
As I recall,t here are two different casting blocks with different WP impeller depth. You have a very expensive block. Take a look t the intakes where they mate to the head. Does the intake plenum look like a "D" shape and is taller than wide? Or does the intake plenum look more like an oval, which is wider than taller? If you have the tall intake plenum, you have a very a very high perf motor there, and I'm pretty sure you will need the high volume pump. If the intakes are more oval, then it is the lower performance model, and may be able to use the lo-buck pump.
If you try the tall impeller pump in the wrong block, it will break the water pump. If you try the cheap low perf water pump in the hi perf block, you will have a huge gap at the back of the impeller, and it will not flow water worth a darn, and will overheat.
Measure the distance from the sealing flange to the end of the inner shaft where the impeller is pinned carefully.
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