Help me identify my motor/heads/water pump. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

snowblind · 11-24-2009, 01:39 AM

Hi Everyone,

My water pump has decided that it wants to leak coolant out of the little hole on it's bottom/front. I'm 99% sure that I have a "long" water pump but I wanted to double check with y'all before I go buy one.

My truck is a bit of a Frankenstein. I know the heads aren't original but I don't know about everything else... I had a conversation with a mechanic friend a few months back and he figured I have "fuel injected" center bolt heads mounted on an "older" block. I figure the water pump/alt/ps probably came off the same motor as the heads but that's really just a guess.

So... What do you guys think? Are there some tell tale signs or casting numbers that I can use for identification the different parts? I'm really just looking for a way to get the right parts for the job without removing the old parts and dragging them down to the store with me.

Here are a couple of photos.

Matt

'72 Jimmy Build

70gmcjimmy · 11-24-2009, 01:58 AM

Sure does look like a long water pump which is junk if coolant is coming out of the "weep hole".
I does look as if the heads are not original and the fan shroud has been trimmed off to get it right with the fan. If there is space between the water pump and the timing chain cover it is probably long and if it is almost touching it it is short. These trucks had a short pump originally.

Later---DAC

snowblind · 11-24-2009, 02:21 PM

Quote:

Originally Posted by 70gmcjimmy

Sure does look like a long water pump. <SNIP> These trucks had a short pump originally.

Later---DAC

I took a look at short and long replacements at the parts store. The long looks very different with a lot more ribbing and support out towards the fan blades. This is what the one on my engine looks like.

I'm going to take some measurements just to be safe. When I order a pump should I just ask for a "long pump for a 350 chevy" or should I ask for a "water pump for a 1978 chevy truck"?

Matt

'72 Jimmy Build

Blazediggity · 11-25-2009, 12:47 AM

If memory serves me correct take off one of the valve covers and the heads are stamped with numbers to tell you what they are...

johnechi · 11-25-2009, 01:26 PM

Ja! Das ist einer langen pumpen.

msgross · 11-25-2009, 01:42 PM

don't worry about the heads...

as stated, if you can see between the water pump and the timing chain cover then it's a long pump, almost touching then short.

I'd take it off (you have to anyway) and go to the parts store. They will have them both in stock for about $25 or so. The main concern is that the pulley mount is the same height as the original... if you lay it falt on the counter that is...

Easy fix but you will need a large drain pan to catch antifreeze and then another bottle to fill it up again. Be sure to mark which holes the bolts came out of, inspect your belts since you have to take them off anyway.

ccr72 · 11-25-2009, 10:33 PM

When you go to the parts store,if you need a short pump, ask for a pump for a 307, as 307,s only came as a short configuration.

Mike C · 11-26-2009, 11:47 AM

The centerbolt valve covers are a giveaway you have 87 or newer cylinder heads. Look on the block back where the bellhousing attaches and you should see a casting # or possibly a displacement casting (5.7l or 5.0l) if it is a later block as well.

You have a long pump on yours. The alternator bracket is one of the giveaways as well as the reinforcing webbing on the pump itself. You can see enough of the pump that you can tell it has about 1/2" clearance between the rear plate and the timing cover.

snowblind · 11-30-2009, 01:36 PM

Hey everyone. Thanks for the replies. I ended up ordering a long water pump from Jegs and the fit was perfect. I also switched over to an electric fan.

Here's a comparison of pumps.

New pump going in.

Finished.

Matt

'72 Jimmy Build

Long Roof · 11-30-2009, 08:59 PM

That doesnt look like a $25 pump

Glad to see your back in business.

msgross · 12-01-2009, 12:07 AM

nice, you don't mess around

snowblind · 12-01-2009, 01:40 AM

Thanks guys.

Here's another shot showing how much room switching to an electric fan freed up. I have a single 12" fan right now but I will upgrade to dual 12" with a shroud next spring. Current daytime temps here are around 40º and the fan hasn't even turned on yet.

Matt

'72 Jimmy Build

robs71k5 · 12-01-2009, 10:19 PM

OK I just finished with the same problem you got .If your looking to go to orig equipent the you will need a short water pump ,A new orig power steering pump,and a clutch fan pulley and crank shaft pulley Cause the stuff you have bolted to the front of you engine is for early 80s truck and there no slow way to do it except all at once cause nothing will line up if you dont. Your welcome LOL

11-24-2009, 01:39 AM	#1
snowblind Registered User Join Date: Oct 2009 Location: SLC, Utah Posts: 164	Help me identify my motor/heads/water pump. Hi Everyone, My water pump has decided that it wants to leak coolant out of the little hole on it's bottom/front. I'm 99% sure that I have a "long" water pump but I wanted to double check with y'all before I go buy one. My truck is a bit of a Frankenstein. I know the heads aren't original but I don't know about everything else... I had a conversation with a mechanic friend a few months back and he figured I have "fuel injected" center bolt heads mounted on an "older" block. I figure the water pump/alt/ps probably came off the same motor as the heads but that's really just a guess. So... What do you guys think? Are there some tell tale signs or casting numbers that I can use for identification the different parts? I'm really just looking for a way to get the right parts for the job without removing the old parts and dragging them down to the store with me. Here are a couple of photos. Matt '72 Jimmy Build

11-24-2009, 01:58 AM	#2
70gmcjimmy GMCDAC Join Date: Apr 2006 Location: Rapid City, SD Posts: 837	Re: Help me identify my motor/heads/water pump. Sure does look like a long water pump which is junk if coolant is coming out of the "weep hole". I does look as if the heads are not original and the fan shroud has been trimmed off to get it right with the fan. If there is space between the water pump and the timing chain cover it is probably long and if it is almost touching it it is short. These trucks had a short pump originally. Later---DAC __________________ 1970 GMC K5 Jimmy Custom 4X4 Mom's driver from 1971 to 2001!! Under rebuild! 1972 GMC C2500 Pickup owned since 1979 Needs a rest and refurbish! 1955 GMC 100 2nd design driven almost daily! Rest In Peace Mom. "Dolly" 7/15/23 - 5/18/09 GMC driver for 30 years!

11-25-2009, 12:47 AM	#4
Blazediggity Registered User Join Date: Feb 2007 Location: Orange Ca. Posts: 11	Re: Help me identify my motor/heads/water pump. If memory serves me correct take off one of the valve covers and the heads are stamped with numbers to tell you what they are...

11-25-2009, 01:26 PM	#5
johnechi Registered User Join Date: Jun 2009 Location: Hesperia, CA Posts: 159	Re: Help me identify my motor/heads/water pump. Ja! Das ist einer langen pumpen.

11-25-2009, 01:42 PM	#6
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: Help me identify my motor/heads/water pump. don't worry about the heads... as stated, if you can see between the water pump and the timing chain cover then it's a long pump, almost touching then short. I'd take it off (you have to anyway) and go to the parts store. They will have them both in stock for about $25 or so. The main concern is that the pulley mount is the same height as the original... if you lay it falt on the counter that is... Easy fix but you will need a large drain pan to catch antifreeze and then another bottle to fill it up again. Be sure to mark which holes the bolts came out of, inspect your belts since you have to take them off anyway. __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

11-25-2009, 10:33 PM	#7
ccr72 Registered User Join Date: Oct 2009 Location: essex mo Posts: 23	Re: Help me identify my motor/heads/water pump. When you go to the parts store,if you need a short pump, ask for a pump for a 307, as 307,s only came as a short configuration.

11-26-2009, 11:47 AM	#8
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,715	Re: Help me identify my motor/heads/water pump. The centerbolt valve covers are a giveaway you have 87 or newer cylinder heads. Look on the block back where the bellhousing attaches and you should see a casting # or possibly a displacement casting (5.7l or 5.0l) if it is a later block as well. You have a long pump on yours. The alternator bracket is one of the giveaways as well as the reinforcing webbing on the pump itself. You can see enough of the pump that you can tell it has about 1/2" clearance between the rear plate and the timing cover. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

11-30-2009, 01:36 PM	#9
snowblind Registered User Join Date: Oct 2009 Location: SLC, Utah Posts: 164	Re: Help me identify my motor/heads/water pump. Hey everyone. Thanks for the replies. I ended up ordering a long water pump from Jegs and the fit was perfect. I also switched over to an electric fan. Here's a comparison of pumps. New pump going in. Finished. Matt '72 Jimmy Build Last edited by snowblind; 11-30-2009 at 01:36 PM.

11-30-2009, 08:59 PM	#10
Long Roof Old School, New Style Join Date: Jun 2005 Location: Monroeville, Ohio Posts: 790	Re: Help me identify my motor/heads/water pump. That doesnt look like a $25 pump Glad to see your back in business. __________________ The Good: - 72 GMC Jimmy 4x4 - 307 cid / 350 th - 70 Chevy Suburban 1/2T 2wd - 454 cid /400 th - 96 Chevy Impala SS - mainly stock - 98 Chevy Tahoe LT 4x4 - all stock The Bad: - 86 Chevy Suburban 1/2T 4x4 - winter beater The Ugly: - 72 Chevy Suburban 1/2T 2wd - parts truck

12-01-2009, 12:07 AM	#11
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: Help me identify my motor/heads/water pump. nice, you don't mess around __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

12-01-2009, 01:40 AM	#12
snowblind Registered User Join Date: Oct 2009 Location: SLC, Utah Posts: 164	Re: Help me identify my motor/heads/water pump. Thanks guys. Here's another shot showing how much room switching to an electric fan freed up. I have a single 12" fan right now but I will upgrade to dual 12" with a shroud next spring. Current daytime temps here are around 40º and the fan hasn't even turned on yet. Matt '72 Jimmy Build Last edited by snowblind; 12-01-2009 at 01:43 AM.

12-01-2009, 10:19 PM	#13
robs71k5 K5drive Join Date: Nov 2004 Location: burnaby BC Canada Posts: 809	Re: Help me identify my motor/heads/water pump. OK I just finished with the same problem you got .If your looking to go to orig equipent the you will need a short water pump ,A new orig power steering pump,and a clutch fan pulley and crank shaft pulley Cause the stuff you have bolted to the front of you engine is for early 80s truck and there no slow way to do it except all at once cause nothing will line up if you dont. Your welcome LOL



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