Long or short water pump? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

KOOLmike · 08-18-2006, 03:34 AM

Sorry if this has been asked before. I have a 72 Chevy short bed 4x4 that I just bought a new crate engine for. It's the 290HP GM Performance motor. I'm needing to buy a water pump for it, but I don't know if I need the short or the long one. I plan to re-use the brackets and pulleys off the old motor, so I want to make sure I get the right pump.
Anybody know which one I need to get?

ETA: I don't have the old motor out of the truck yet, which is why I can't take the pump up to the parts store with me.

al's71gmc · 08-18-2006, 05:04 AM

Look down and see if the inside edge of your WP is in line with the outside edge of your timing cover. If so it's a short, if there is 3/4" or so gap then it's a long one. I believe this is accurate, but not 100% sure. All 3 of the original motors I've got use the short, and the one with an 86 with serp belt uses the longer one.

KOOLmike · 08-18-2006, 05:09 AM

Cool, man. I kinda figured it'd be the short one, as they seem to be the most popular on the older motors. Thanks for the reply!

Blazer1970 · 08-18-2006, 06:36 AM

The stock pump was short. All trucks used short pumps until '73.

**1970 CST Short Wide** · 08-18-2006, 09:54 AM

You'll like that Motor, we have one in my Sons 71 LWB in front of a Muncie 4 speed. Lots of fun to drive, great power for what it is.

sneakysnake · 08-18-2006, 12:02 PM

pics

Inthuwind · 08-18-2006, 12:04 PM

How about a '69 396 BBC??

Roachgod · 08-18-2006, 07:55 PM

Quote:

Originally Posted by Inthuwind

How about a '69 396 BBC??

Same situation here 70 truck, soon to have 454. short or long water pump?

KOOLmike · 08-19-2006, 12:19 AM

Quote:

Originally Posted by 1970 CST Short Wide

You'll like that Motor, we have one in my Sons 71 LWB in front of a Muncie 4 speed. Lots of fun to drive, great power for what it is.

Yeah, I like it already. Everything but the "Hecho en Mexico" embossment, that is.

And it turned out the pump I needed was the long one. The current motor must not be the original.

LUV2XCLR8 · 08-19-2006, 07:44 AM

The only way I know on a SBC is this, Short = Drivers side Alt, Long = Passenger side Alt

KOOLmike · 08-19-2006, 07:15 PM

Quote:

Originally Posted by LUV2XCLR8

The only way I know on a SBC is this, Short = Drivers side Alt, Long = Passenger side Alt

That seems to be the case with my motor. That's a great way to remember that as well!

crusher311 · 08-20-2006, 05:44 AM

short shaft was the most comin one found but thay also had the long shaft in some parts are cheaper for the long shaft and easyer to find. in all types the long shaft was more often found in heavy duty applications becouse it moved more coolant then a short shaft could ever hope toi have a short shaft in mine and it is a pain becouse all the pullies i have are from a long shaft it has been a pain but i have them all lined up after 6 months of tinkering. i wasnt going to spend 60 bucks a pully or 100 bucks for a long shaft to fix the problem but yes long shaft is better anyways

crusher311 · 08-20-2006, 05:48 AM

ohhh yes and a corection i had pullies long shaft but all my brackets were short shaft but long shafts are better plus more performance options for the long shafts

70c10 · 08-20-2006, 12:30 PM

My truck has the lwp and the passenger side alternator.

08-18-2006, 03:34 AM	#1
KOOLmike Registered User Join Date: Jul 2005 Location: Methdependence, MO Posts: 30	Long or short water pump? Sorry if this has been asked before. I have a 72 Chevy short bed 4x4 that I just bought a new crate engine for. It's the 290HP GM Performance motor. I'm needing to buy a water pump for it, but I don't know if I need the short or the long one. I plan to re-use the brackets and pulleys off the old motor, so I want to make sure I get the right pump. Anybody know which one I need to get? ETA: I don't have the old motor out of the truck yet, which is why I can't take the pump up to the parts store with me. __________________ 1972 Chevy SWB 4x4 Last edited by KOOLmike; 08-18-2006 at 03:35 AM.

08-18-2006, 05:04 AM	#2
al's71gmc 4 eyed fever Join Date: Jul 2005 Location: Eureka, Nevada Posts: 500	Re: Long or short water pump? Look down and see if the inside edge of your WP is in line with the outside edge of your timing cover. If so it's a short, if there is 3/4" or so gap then it's a long one. I believe this is accurate, but not 100% sure. All 3 of the original motors I've got use the short, and the one with an 86 with serp belt uses the longer one. __________________ 1971 GMC 2500 4x4 1972 GMC Sierra Grande 1/2 t 4x4-#1 son's truck. Recently completed resto. 4 YO daughter," Daddy, I like your truck better than Mom's." (2000 F350-ranch truck) Smart kid!!

08-18-2006, 05:09 AM	#3
KOOLmike Registered User Join Date: Jul 2005 Location: Methdependence, MO Posts: 30	Re: Long or short water pump? Cool, man. I kinda figured it'd be the short one, as they seem to be the most popular on the older motors. Thanks for the reply! __________________ 1972 Chevy SWB 4x4

08-18-2006, 06:36 AM	#4
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,507	Re: Long or short water pump? The stock pump was short. All trucks used short pumps until '73. __________________ Tim

08-18-2006, 09:54 AM	#5
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,193	Re: Long or short water pump? You'll like that Motor, we have one in my Sons 71 LWB in front of a Muncie 4 speed. Lots of fun to drive, great power for what it is. __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565

08-18-2006, 12:02 PM	#6
sneakysnake It's a catastrophic success. Join Date: Jan 2003 Location: Oklahoma Posts: 2,077	Re: Long or short water pump? pics Attached Images

08-18-2006, 12:04 PM	#7
Inthuwind Straight jacket required Join Date: Oct 2003 Location: OKC, OK Posts: 882	Re: Long or short water pump? How about a '69 396 BBC?? __________________ 1968 C10 Short Stepper 350/350 A/C P/S P/B Front disc 3/5 static/ 12bolt rear 3:73 1979 Pontiac Trans Am 10th Anniversary/455/4spd 2011 H-D Street Glide - CAMMED n lowered Dad always said,"Son, if you can't be good...be good at it."

08-19-2006, 07:44 AM	#10
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,468	Re: Long or short water pump? The only way I know on a SBC is this, Short = Drivers side Alt, Long = Passenger side Alt __________________ Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T

08-20-2006, 05:44 AM	#12
crusher311 Registered User Join Date: Aug 2006 Location: kenai alaska Posts: 25	Re: Long or short water pump? short shaft was the most comin one found but thay also had the long shaft in some parts are cheaper for the long shaft and easyer to find. in all types the long shaft was more often found in heavy duty applications becouse it moved more coolant then a short shaft could ever hope toi have a short shaft in mine and it is a pain becouse all the pullies i have are from a long shaft it has been a pain but i have them all lined up after 6 months of tinkering. i wasnt going to spend 60 bucks a pully or 100 bucks for a long shaft to fix the problem but yes long shaft is better anyways

08-20-2006, 05:48 AM	#13
crusher311 Registered User Join Date: Aug 2006 Location: kenai alaska Posts: 25	Re: Long or short water pump? ohhh yes and a corection i had pullies long shaft but all my brackets were short shaft but long shafts are better plus more performance options for the long shafts

08-20-2006, 12:30 PM	#14
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Re: Long or short water pump? My truck has the lwp and the passenger side alternator. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads



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