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Water Pump Question

Old Jul 27, 2021 | 08:44 PM
  #1  
Brannon's Avatar
Brannon
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I have a 1980 and a friend I just pulled the engine to replace it with a BluePrint 400ci. While we're at it, I'm replacing the accessory drive with a serpentine setup from a 4.3L Vortech. My friend has the parts and says it will fit.

I know I will need a reverse flow water pump.

I'm looking on Summit's site and I have a few questions for those of you in the know:
  1. Do I get Short of Long?
  2. Is the pilot diameter .625 (most common it seems)?
  3. What inlet diameter? 1.800", 1.875" or 1.75"?
Any other thoughts or recommendations would be appreciated.

Thanks,
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Old Jul 27, 2021 | 10:05 PM
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use the pump from that 4.3L ... or one exactly like it. You didn't state which vehicle year & model that serp setup is from ?

and it's Not reverse flow ... it Is reverse rotation ... and (unless you're going to electric fan) requires a reverse rotation/pitch FAN

Last edited by ebbnflow; Jul 27, 2021 at 10:07 PM.
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Old Jul 27, 2021 | 10:32 PM
  #3  
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Originally Posted by ebbnflow
use the pump from that 4.3L ... or one exactly like it. You didn't state which vehicle year & model that serp setup is from ?

and it's Not reverse flow ... it Is reverse rotation ... and (unless you're going to electric fan) requires a reverse rotation/pitch FAN
Thanks. I meant to say reverse or counterclockwise rotation.

I don’t think he has the pump for it, but I’ll ask what model and year the other parts are from.
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Old Jul 29, 2021 | 07:46 AM
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post a clear pic or two of water pump PULLEY ... want to see if it has a BIG pilot hole (for late pump w/ BIG threaded "pilot" for threaded fan clutch)
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