short water pump and a 305 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71/454 · 05-27-2008, 08:31 PM

I've got the new motor bolted in for my turbo project and I went to go bolt up the water pump but it won't fit. The truck is a 72 with power steering, previously had a 350 with a short water pump. The 305 i put in wont allow me to bolt up the short pump because the tube thingy on the timing tab hits the back of the pump, and the pulleys aren't even close to lining up. So I put the long water pump on and the pulleys for the power steering don't look like they line up. I currently have the crank pulley off the old 350 installed and that of course won't line up(i threw out the 305 crank pulley, doh!) so I have to get a 305 one. I have done a search, but of course if I put in 305, it omits it. All that i have come up with is to change the power steering pump to a newer style one. Is this all that can be done to fix it? I just figured out that my turbo headers don't fit the truck so I have some fab time coming up and would really like something to bolt in for once. Thanks, Dave

fnoblitt · 05-27-2008, 08:54 PM

couldn't you use the timing cover off the older 350 ? then everything else should bolt up .

68GMCCustom · 05-27-2008, 09:42 PM

I had a similar problem. Started out swapping a metric 305 for an old style 350...and the problems started with the brackets...and the pullies...and the PS pump.

I wound up swapping all the 80's stuff (brackets, pullies, o-ring ps pump vs flange style) out for 70's stuff to put my truck right, including a new set of March pullies and brackets.

If you problem is just the p/s...I think you can just change out the fittings on the back of the p/s pump, or use adapters on the p/s box if needed.

Longhorn Man · 05-27-2008, 10:55 PM

Then the problem comes in, that the fan is WAY too far in the shroud (see above photo)

**truckdude239** · 05-28-2008, 03:05 AM

umm i installeda short water pump on ym 305 out of an 78 works fine

68GMCCustom · 05-28-2008, 05:18 AM

Quote:

Originally Posted by Longhorn Man

Then the problem comes in, that the fan is WAY too far in the shroud (see above photo)

...the adapter is too long....and that's a 4WD fan shroud.

71/454 · 05-28-2008, 06:41 AM

According to the numbers it's a 78 305. The balancer is much fatter than the 350 that came out. The backplate of the waterpump touches the timing cover, TRUCKDUDE239 perhaps someone had already swapped timing covers and balancers for you. When I went to try the short pump I also had the pulley on it and the groves were in line with the balancer so I knew that was wrong. The good news is that I did find the crank pulley I thought I tossed, so I think I'll just change the p/s pump.
LONGHORNMAN, I was wondering if that would be a problem. On my big block I couldn't run a clutch fan because I ran a long pump.
Thanks for the help guys, I'm a recovering big block guy just trying to stay away from the gas pumps. I really thought all small block stuff interchanged easily.

**truckdude239** · 05-28-2008, 02:43 PM

i used a new balancer that was bigger then my old one but i installed a cromes timing cover and vavle covers so i guess thats why mine fit

watahyahknow · 12-09-2009, 10:45 PM

there was talk on the forum a while back about some electric fan that mounted perfectly inside a stock chevy shroud not sure think it was sumtin about a recal from jeep the kit was made to replace the faulty one and was pretty cheap

05-27-2008, 08:31 PM	#1
71/454 Turbo Guy Join Date: Jan 2005 Location: Calgary Alberta Posts: 353	short water pump and a 305 I've got the new motor bolted in for my turbo project and I went to go bolt up the water pump but it won't fit. The truck is a 72 with power steering, previously had a 350 with a short water pump. The 305 i put in wont allow me to bolt up the short pump because the tube thingy on the timing tab hits the back of the pump, and the pulleys aren't even close to lining up. So I put the long water pump on and the pulleys for the power steering don't look like they line up. I currently have the crank pulley off the old 350 installed and that of course won't line up(i threw out the 305 crank pulley, doh!) so I have to get a 305 one. I have done a search, but of course if I put in 305, it omits it. All that i have come up with is to change the power steering pump to a newer style one. Is this all that can be done to fix it? I just figured out that my turbo headers don't fit the truck so I have some fab time coming up and would really like something to bolt in for once. Thanks, Dave __________________ 1972 Gmc Custom swb intercooled twin turbo 327 10.5-1 and 12 lbs of boost, Nodular iron case super t-10 4 speed with a blowproof bellhousing, 12 bolt eaton posi soon to have moser axles. 1998 Honda CR250 fully ported, case matched, milled head, vortexed carb and revalved suspension but don't forget the woody woodpecker decal kit! Things I've broken so far: 12 bolt diff saginaw 4 spd many, many pieces Aluminum case Super t-10 4 spd

05-27-2008, 08:54 PM	#2
fnoblitt Registered User Join Date: Mar 2002 Location: southern calif.,usa Posts: 200	Re: short water pump and a 305 couldn't you use the timing cover off the older 350 ? then everything else should bolt up . __________________ 70 c10 stepside ,350v8, m-20 4 speed

05-27-2008, 09:42 PM	#3
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: short water pump and a 305 I had a similar problem. Started out swapping a metric 305 for an old style 350...and the problems started with the brackets...and the pullies...and the PS pump. I wound up swapping all the 80's stuff (brackets, pullies, o-ring ps pump vs flange style) out for 70's stuff to put my truck right, including a new set of March pullies and brackets. If you problem is just the p/s...I think you can just change out the fittings on the back of the p/s pump, or use adapters on the p/s box if needed. __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

05-27-2008, 10:55 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: short water pump and a 305 Then the problem comes in, that the fan is WAY too far in the shroud (see above photo)

05-28-2008, 03:05 AM	#5
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,238	Re: short water pump and a 305 umm i installeda short water pump on ym 305 out of an 78 works fine __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

05-28-2008, 06:41 AM	#7
71/454 Turbo Guy Join Date: Jan 2005 Location: Calgary Alberta Posts: 353	Re: short water pump and a 305 According to the numbers it's a 78 305. The balancer is much fatter than the 350 that came out. The backplate of the waterpump touches the timing cover, TRUCKDUDE239 perhaps someone had already swapped timing covers and balancers for you. When I went to try the short pump I also had the pulley on it and the groves were in line with the balancer so I knew that was wrong. The good news is that I did find the crank pulley I thought I tossed, so I think I'll just change the p/s pump. LONGHORNMAN, I was wondering if that would be a problem. On my big block I couldn't run a clutch fan because I ran a long pump. Thanks for the help guys, I'm a recovering big block guy just trying to stay away from the gas pumps. I really thought all small block stuff interchanged easily. __________________ 1972 Gmc Custom swb intercooled twin turbo 327 10.5-1 and 12 lbs of boost, Nodular iron case super t-10 4 speed with a blowproof bellhousing, 12 bolt eaton posi soon to have moser axles. 1998 Honda CR250 fully ported, case matched, milled head, vortexed carb and revalved suspension but don't forget the woody woodpecker decal kit! Things I've broken so far: 12 bolt diff saginaw 4 spd many, many pieces Aluminum case Super t-10 4 spd

05-28-2008, 02:43 PM	#8
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,238	Re: short water pump and a 305 i used a new balancer that was bigger then my old one but i installed a cromes timing cover and vavle covers so i guess thats why mine fit __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

12-09-2009, 10:45 PM	#9
watahyahknow Registered User Join Date: Jul 2006 Location: the netherlands europe Posts: 4,335	Re: short water pump and a 305 there was talk on the forum a while back about some electric fan that mounted perfectly inside a stock chevy shroud not sure think it was sumtin about a recal from jeep the kit was made to replace the faulty one and was pretty cheap __________________ i got a job again and having fun at it too idea's for the trucks and the order of things to do are taking shape and get closer to being realized , a few more months and i be able to start building for real i complete 2 of the trucks intoo running fashion one custom and one basicly stock the thirth will be sacrificed for parts



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