SBC Water pump Pulley Problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JR Dean · 09-12-2013, 07:32 PM

In building a 350 SBC for my '63 GMC I've run into a problem. There were no pulleys with this engine when I bought it. It needs a 7" dia. pulley for a short water pump with a wide bolt pattern on the flange. So far all the pulleys that I've found are for the narrow bolt pattern flange and the only pulleys that have the wide bolt pattern are for long water pumps.

Can anyone tell me if the pulley that I need has ever been made and where one could be found? Thanks in advance.

tincan1966 · 09-12-2013, 08:21 PM

http://images.oreillyauto.com/parts/.../mtc/cp898.jpg
might be easier to get a water pump that has the dual bolt pattern like this one at O'reily's
Murray brand part number CP898

chevyrestoguy · 09-12-2013, 08:28 PM

^^^Definitely. Sometimes, finding the right pulley combinations can be like finding a needle in a haystack. Swapping out the water pump is by far the easiest way to solve your issue. It's cheap, and you'll have a fresh water pump, and that's never a bad thing.

JR Dean · 09-12-2013, 08:47 PM

The pump that is on the engine now is new from Advance Auto with the dual bolt pattern. The problem going with the small bolt pattern becomes finding a 1 1/2" spacer and a fan both with the small bolt pattern. One posibility may be drilling the pulley that I have to match the the dual pattern pump flange.

tincan1966 · 09-12-2013, 08:50 PM

I believe the stock spacer and 4 blade fan from an I6 is the small bolt pattern.

tincan1966 · 09-12-2013, 08:53 PM

http://images.oreillyauto.com/parts/...e/hdn/3969.jpg

Hayden part number 3969 $12.99 @ O'Reilly's, then all you need is a universal fan

tincan1966 · 09-12-2013, 08:56 PM

http://images.oreillyauto.com/parts/.../flx/2615p.jpg

Flex-a-lite universal fan PN # 2615

JR Dean · 09-13-2013, 10:10 PM

To save time I laid out the large pattern drilling points on the pulley that was on hand. Proceeded with drilling and ended up with a dual pattern pulley. Everything went together just fine.

If there is a next time I think I'll use the Hayden spacer and Flexalite fan that tincan1966 pointed out.

09-12-2013, 07:32 PM	#1
JR Dean Registered User Join Date: Jan 2013 Location: LaVale MD Posts: 17	SBC Water pump Pulley Problem In building a 350 SBC for my '63 GMC I've run into a problem. There were no pulleys with this engine when I bought it. It needs a 7" dia. pulley for a short water pump with a wide bolt pattern on the flange. So far all the pulleys that I've found are for the narrow bolt pattern flange and the only pulleys that have the wide bolt pattern are for long water pumps. Can anyone tell me if the pulley that I need has ever been made and where one could be found? Thanks in advance.

09-12-2013, 08:21 PM	#2
tincan1966 Registered User Join Date: Oct 2010 Location: Independence,KS Posts: 1,477	Re: SBC Water pump Pulley Problem http://images.oreillyauto.com/parts/.../mtc/cp898.jpg might be easier to get a water pump that has the dual bolt pattern like this one at O'reily's Murray brand part number CP898

09-12-2013, 08:28 PM	#3
chevyrestoguy Registered User Join Date: Mar 2005 Location: apple valley, ca Posts: 2,670	Re: SBC Water pump Pulley Problem ^^^Definitely. Sometimes, finding the right pulley combinations can be like finding a needle in a haystack. Swapping out the water pump is by far the easiest way to solve your issue. It's cheap, and you'll have a fresh water pump, and that's never a bad thing. __________________ Check out my latest endeavor: https://roundsixpod.com My build threads: '55 Chevy: http://67-72chevytrucks.com/vboard/s...d.php?t=247512 '64 C-20: http://67-72chevytrucks.com/vboard/s...d.php?t=446527

09-12-2013, 08:47 PM	#4
JR Dean Registered User Join Date: Jan 2013 Location: LaVale MD Posts: 17	Re: SBC Water pump Pulley Problem The pump that is on the engine now is new from Advance Auto with the dual bolt pattern. The problem going with the small bolt pattern becomes finding a 1 1/2" spacer and a fan both with the small bolt pattern. One posibility may be drilling the pulley that I have to match the the dual pattern pump flange.

09-12-2013, 08:50 PM	#5
tincan1966 Registered User Join Date: Oct 2010 Location: Independence,KS Posts: 1,477	Re: SBC Water pump Pulley Problem I believe the stock spacer and 4 blade fan from an I6 is the small bolt pattern.

09-12-2013, 08:53 PM	#6
tincan1966 Registered User Join Date: Oct 2010 Location: Independence,KS Posts: 1,477	Re: SBC Water pump Pulley Problem http://images.oreillyauto.com/parts/...e/hdn/3969.jpg Hayden part number 3969 $12.99 @ O'Reilly's, then all you need is a universal fan

09-12-2013, 08:56 PM	#7
tincan1966 Registered User Join Date: Oct 2010 Location: Independence,KS Posts: 1,477	Re: SBC Water pump Pulley Problem http://images.oreillyauto.com/parts/.../flx/2615p.jpg Flex-a-lite universal fan PN # 2615

09-13-2013, 10:10 PM	#8
JR Dean Registered User Join Date: Jan 2013 Location: LaVale MD Posts: 17	Re: SBC Water pump Pulley Problem To save time I laid out the large pattern drilling points on the pulley that was on hand. Proceeded with drilling and ended up with a dual pattern pulley. Everything went together just fine. If there is a next time I think I'll use the Hayden spacer and Flexalite fan that tincan1966 pointed out.



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