Water pump Nailhead 425

F

Fruck

Member
Hi Everyone,
Is there anyone who knows about water pumps for Nailhead 425?
I have been told that there is one model that have five blades, that should be the one for cars with AC. My question is if that one has the same bolt pattern as the one for cars without AC so I can use it on mine?
I do have my Electra that doesn’t like to go slow on cruising :sad:
 
typically, you can use either, the more important consideration is if the pump snout is of the proper length so the pulleys line up. at least, that's the way it is with big block Buicks. i would double check everything else in the cooling system though. assuming the pump blades are still in good shape, it shouldn't have a problem keeping up with low power conditions. do you have a clutch fan? does the clutch lock up once the engine reaches operating temp? have you had the radiator flushed? what kind of shape is the radiator in? have you tried new hoses and thermostat? the vacuum hose from the radiator to the pump is prone to sucking shut if it doesn't have the proper reinforcement in it, which blocks water flow.
 
Here is a link to a 5 blade:

nailhead heavy duty water pump, 5 blade
1
 
bob k. mando said:
typically, you can use either, the more important consideration is if the pump snout is of the proper length so the pulleys line up. at least, that's the way it is with big block Buicks. i would double check everything else in the cooling system though. assuming the pump blades are still in good shape, it shouldn't have a problem keeping up with low power conditions. do you have a clutch fan? does the clutch lock up once the engine reaches operating temp? have you had the radiator flushed? what kind of shape is the radiator in? have you tried new hoses and thermostat? the vacuum hose from the radiator to the pump is prone to sucking shut if it doesn't have the proper reinforcement in it, which blocks water flow.
Click to expand...
Thanks for your answer, I don't have a clutch fan, it run always. The radiator is rebuild with new cells and the lower hose has an pipe for not sucking shut.
I has order a new pump with 5 blade, just have to wait....
 
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