V6 water pump on V8 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BOZO · 03-08-2010, 09:19 PM

I am installing a serpentine drive from a 1999 4.3 liter V6 on a
350 small block V8. Most everything seems to be pretty well
straight forward, including drilling & tapping the extra hole in
the passenger head. My question is, can I use the reverse
rotation water pump from the V6 or do I need to use something
different? If so what do I need?
The water pump will physically bolt up, but I am concerned
about the circulation. If somebody has been down this route
I would appreciate some feedback.

Tx Firefighter · 03-08-2010, 09:49 PM

It's the same part with the same part number for both V6 and V8 applications.

silverstreak · 03-08-2010, 10:37 PM

I did a similar swap on a 70 Chevelle a few years ago and didn't have any problems from the reverse rotation. However, if you're running a mechanical fan, make sure you use the appropriate fan for the pump. Reverse rotation pumps require a fan with the blades angled opposite direction of a fan for a conventional pump, so it will still pull air through the radiator and not try to shove it into the radiator.

BOZO · 03-08-2010, 10:51 PM

Tx Firefighter,
THANKS

Tx Firefighter · 03-08-2010, 10:57 PM

You bet buddy, I just went to O Reilly's website and cataloged a pump for a 4.3 V6 and a 5.7 V8 and they were the same part number.

WHAMMYBAR66 · 03-08-2010, 11:16 PM

DUDE ! I am doing the same swap !!

My problem is centered around the water pump too !! Mainly, the heater hoses.

The 4.3l pump I have has two metal heater hose ports and I don't know what I would do with them if I used it. Do you have any ideas on that ?

My current v-belt set up has one heater hose that goes to the intake and one to the water pump. I don't have a port on the passenger side of my radiator for a heater hose like some trucks so I need to get one hose back to the water pump.

I am trying to find a reverse flow water pump with only one heater hose port on the top center of the pump.. I have pics of one from another forum.. but can't find it so I can order it.

Post pics ASAP ! Any help appreciated !

Whammybar66

Hit me up with your thoughts in this ! Please !

wildwilly4x4 · 03-09-2010, 01:26 AM

Go get a pump fpr a TBI rig, sound like yours is off a serpetine setup from the vortec gen 350s and 4.3s(96-99). The pumps from 88-94 or so should work just like your v-belt pump, they just spin backwards.

03-08-2010, 09:19 PM	#1
BOZO Old School Join Date: Jan 2010 Location: Dover,AR Posts: 185	V6 water pump on V8 I am installing a serpentine drive from a 1999 4.3 liter V6 on a 350 small block V8. Most everything seems to be pretty well straight forward, including drilling & tapping the extra hole in the passenger head. My question is, can I use the reverse rotation water pump from the V6 or do I need to use something different? If so what do I need? The water pump will physically bolt up, but I am concerned about the circulation. If somebody has been down this route I would appreciate some feedback.

03-08-2010, 09:49 PM	#2
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: V6 water pump on V8 It's the same part with the same part number for both V6 and V8 applications. __________________ I'm on the Instagram- @Gearhead_Kevin

03-08-2010, 10:37 PM	#3
silverstreak Registered User Join Date: Mar 2009 Location: USA Posts: 255	Re: V6 water pump on V8 I did a similar swap on a 70 Chevelle a few years ago and didn't have any problems from the reverse rotation. However, if you're running a mechanical fan, make sure you use the appropriate fan for the pump. Reverse rotation pumps require a fan with the blades angled opposite direction of a fan for a conventional pump, so it will still pull air through the radiator and not try to shove it into the radiator.

03-08-2010, 10:51 PM	#4
BOZO Old School Join Date: Jan 2010 Location: Dover,AR Posts: 185	Re: V6 water pump on V8 Tx Firefighter, THANKS

03-08-2010, 10:57 PM	#5
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: V6 water pump on V8 You bet buddy, I just went to O Reilly's website and cataloged a pump for a 4.3 V6 and a 5.7 V8 and they were the same part number. __________________ I'm on the Instagram- @Gearhead_Kevin

03-08-2010, 11:16 PM	#6
WHAMMYBAR66 Registered User Join Date: May 2009 Location: LEE'S SUMMIT, MO Posts: 99	Re: V6 water pump on V8 DUDE ! I am doing the same swap !! My problem is centered around the water pump too !! Mainly, the heater hoses. The 4.3l pump I have has two metal heater hose ports and I don't know what I would do with them if I used it. Do you have any ideas on that ? My current v-belt set up has one heater hose that goes to the intake and one to the water pump. I don't have a port on the passenger side of my radiator for a heater hose like some trucks so I need to get one hose back to the water pump. I am trying to find a reverse flow water pump with only one heater hose port on the top center of the pump.. I have pics of one from another forum.. but can't find it so I can order it. Post pics ASAP ! Any help appreciated ! Whammybar66 Hit me up with your thoughts in this ! Please !

03-09-2010, 01:26 AM	#7
wildwilly4x4 Registered User Join Date: Aug 2009 Location: Sunray,TX Posts: 251	Re: V6 water pump on V8 Go get a pump fpr a TBI rig, sound like yours is off a serpetine setup from the vortec gen 350s and 4.3s(96-99). The pumps from 88-94 or so should work just like your v-belt pump, they just spin backwards.



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