V6 to V8 swap water pump

Radiator, thermostat, water pump, antifreeze, etc.
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AquaAngel
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V6 to V8 swap water pump

Post by AquaAngel »

This might be a silly question, but i will soon work on my new motor and on this process, i will be putting back my accessory bracket from my v6 to my V8 and i just found out that the water pump that i bought for the V8 rotates counter clock wise while my v6 is clockwise.

the big question is, can i use a water pump off a v6 onto a v8 350?

Thanks
93 Astro Van army blue [V8/350/5.7L]
------------

Chevy owned:
93 Astro cargo Van "Phantom Rebel"
98 GMC Safari AWD
09 GMC C5500 6.6L, Duramax "3 ton truck"
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1Gary
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Re: V6 to V8 swap water pump

Post by 1Gary »

Why don't you just return the wrong pump for the right one??.
1979 Malibu drag race only car
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......


Rochester,NY

Kidhauler
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Re: V6 to V8 swap water pump

Post by Kidhauler »

A v6 pump will fit
1999 Safari Touring edition.
trailer tow pack with a 3:73 posi
Bucket bench seats, Rear heat, Rear Airconditioning.
teal green
300 000 kms
AirRide air bags in the rear to fix soft stock suspension.
Onboard aircompressor to make it all work nice.
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1Gary
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Re: V6 to V8 swap water pump

Post by 1Gary »

If the engine you have requires a reverse rotation W/P,you can't run a normal rotation W/P on it.
1979 Malibu drag race only car
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......


Rochester,NY
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Topic author
AquaAngel
I finally get the smurf thing
Posts: 148
Joined: Thu Apr 21, 2011 9:48 pm
Location: Nanaimo, Bc, Canada

Re: V6 to V8 swap water pump

Post by AquaAngel »

Mix review, so if it is reversed, can i fool around with the belt to make it work in reverse?
93 Astro Van army blue [V8/350/5.7L]
------------

Chevy owned:
93 Astro cargo Van "Phantom Rebel"
98 GMC Safari AWD
09 GMC C5500 6.6L, Duramax "3 ton truck"

LiftedAWDAstro
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Re: V6 to V8 swap water pump

Post by LiftedAWDAstro »

I wouldn't risk it. Water pumps are so cheap new, why mess with what works?
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition

Mileage spreadsheet

Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy

Kidhauler
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Re: V6 to V8 swap water pump

Post by Kidhauler »

A 4.3 v6 is the same engine as a 350v8 just with 2 cylinders cut off. So the direction of water would make no difference would it? If you use the v6 accesories and brackets then use the v6 pump they should pump the same amount of water. The big thing to watch is that you use the right fan for the direction of rotation. We accidently put a v8 fan on v6 pulleys and it blew air out the front of rad. The van was fine on the highway and stop and go traffic but at city speeds the van would over heat. Once the fan was put back every thing was fine and that truck had a v6 pump on a v8.
1999 Safari Touring edition.
trailer tow pack with a 3:73 posi
Bucket bench seats, Rear heat, Rear Airconditioning.
teal green
300 000 kms
AirRide air bags in the rear to fix soft stock suspension.
Onboard aircompressor to make it all work nice.
User avatar

1Gary
I have my van tatooed on my cheeks
Posts: 2743
Joined: Wed Oct 07, 2009 4:18 am

Re: V6 to V8 swap water pump

Post by 1Gary »

KH-the water jackets are configured different on reverse rotation engines.
1979 Malibu drag race only car
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......


Rochester,NY

Kidhauler
I sleep in my van
Posts: 877
Joined: Wed Sep 13, 2006 5:46 pm
Location: Vancouver B.C.

Re: V6 to V8 swap water pump

Post by Kidhauler »

It's a centrifugal pump it sucks from one side and blows out the other it shouldn't matter which way the pump spins I have put a v6 pump on a v8 that origionaly spun the other way and that engine still runs fine today and that had to be 5 years ago.
1999 Safari Touring edition.
trailer tow pack with a 3:73 posi
Bucket bench seats, Rear heat, Rear Airconditioning.
teal green
300 000 kms
AirRide air bags in the rear to fix soft stock suspension.
Onboard aircompressor to make it all work nice.
User avatar

1Gary
I have my van tatooed on my cheeks
Posts: 2743
Joined: Wed Oct 07, 2009 4:18 am

Re: V6 to V8 swap water pump

Post by 1Gary »

The valve seat cooling is where the difference is.

To be more exact,the coolant passages design and direction effects the cooling of the exhaust valve seats.GM did this as a upgrade.
1979 Malibu drag race only car
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......


Rochester,NY
User avatar

Topic author
AquaAngel
I finally get the smurf thing
Posts: 148
Joined: Thu Apr 21, 2011 9:48 pm
Location: Nanaimo, Bc, Canada

Re: V6 to V8 swap water pump

Post by AquaAngel »

Thanks for replies

yes i will be using the acc bracket off my v6 to put on the V8.
As for the cooling Fan? i will be using an Electric Fan as i will need more room to work on the rad or water pump if it ever fails. so the Clutch fan and all will be gone and will put an Electric one in it.

Plus i will be lifting the body for another 2 inches, so the Fan Shroud will have to be cut. So i am not worried about putting the Cooling fan back in it.
93 Astro Van army blue [V8/350/5.7L]
------------

Chevy owned:
93 Astro cargo Van "Phantom Rebel"
98 GMC Safari AWD
09 GMC C5500 6.6L, Duramax "3 ton truck"
User avatar

Topic author
AquaAngel
I finally get the smurf thing
Posts: 148
Joined: Thu Apr 21, 2011 9:48 pm
Location: Nanaimo, Bc, Canada

Re: V6 to V8 swap water pump

Post by AquaAngel »

1Gary wrote:Why don't you just return the wrong pump for the right one??.
I can do that, i just want to make sure that the W/P deliver the pressure that the motor need for cooling as i can read a lot of comment here about it, but i will definitely try the V8 W/p going Clockwise
93 Astro Van army blue [V8/350/5.7L]
------------

Chevy owned:
93 Astro cargo Van "Phantom Rebel"
98 GMC Safari AWD
09 GMC C5500 6.6L, Duramax "3 ton truck"

Kidhauler
I sleep in my van
Posts: 877
Joined: Wed Sep 13, 2006 5:46 pm
Location: Vancouver B.C.

Re: V6 to V8 swap water pump

Post by Kidhauler »

The electric fan is also good for a gain of aprox 15-20 hp depending on the number of fan blades.
1999 Safari Touring edition.
trailer tow pack with a 3:73 posi
Bucket bench seats, Rear heat, Rear Airconditioning.
teal green
300 000 kms
AirRide air bags in the rear to fix soft stock suspension.
Onboard aircompressor to make it all work nice.
User avatar

Topic author
AquaAngel
I finally get the smurf thing
Posts: 148
Joined: Thu Apr 21, 2011 9:48 pm
Location: Nanaimo, Bc, Canada

Re: V6 to V8 swap water pump

Post by AquaAngel »

Just got the fan this week end and it is a 10 Blade, 16" electric fan, the van will soon be of the road as the motor is almost ready.
93 Astro Van army blue [V8/350/5.7L]
------------

Chevy owned:
93 Astro cargo Van "Phantom Rebel"
98 GMC Safari AWD
09 GMC C5500 6.6L, Duramax "3 ton truck"
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