Short or Long Water Pump? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Andrew68c10 · 07-19-2003, 04:25 PM

Could anyone help?
On a small block, I'm going with electric fans and eventually an Old Air system, but for now it's just the p/s and the alternator that I have to run. Would I need a new p/s bracket and alternator bracket if I switch to long water pump? I have a newer large damper. Will that cause a conflict?

ddsmith · 07-19-2003, 06:02 PM

Old Air recommends keeping the stock mechanical fan with clutch and a shroud for their units. The best location for the alternator and p/s pump is drivers side. Makes for a cleaner A/C compressor install. I don't know about the conversion to long pump though but do know that they need to know short or long pump when ordering the A/C unit for the pulleys to line up. I'm pretty sure the brackets for the p/s and alternator need changed do to the pulley location changing. Since I believe cars with 350 from the mid 70's on had long pumps the brackets should be available readily in the junk yard.

**JIMs70GMC** · 07-21-2003, 05:39 AM

I think the brackets will need to be changed. Our trucks came with the short pump w/ the PS brackets mounted to the block and engine mount. with a long pump the PS bracket is mounted w/ the wp and block. The long pumps deput in late 60s in the GM cars and trucks in 73 I believe. Except w/ vettes.

**GMCPaul** · 07-21-2003, 07:12 AM

The brackets will need to be changed if switching to a long neck water pump as will crank & water pump pulleys. The larger 8" harmonic balancer will not affect choice of water pumps or pulleys.
GMCPaul

07-19-2003, 04:25 PM	#1
Andrew68c10 Registered User Join Date: Sep 2000 Location: Paso Robles, CA Posts: 178	Short or Long Water Pump? Could anyone help? On a small block, I'm going with electric fans and eventually an Old Air system, but for now it's just the p/s and the alternator that I have to run. Would I need a new p/s bracket and alternator bracket if I switch to long water pump? I have a newer large damper. Will that cause a conflict?

07-19-2003, 06:02 PM	#2
ddsmith Glowing since 1978 Join Date: Mar 2001 Location: Lusby,MD,USA Posts: 532	Old Air recommends keeping the stock mechanical fan with clutch and a shroud for their units. The best location for the alternator and p/s pump is drivers side. Makes for a cleaner A/C compressor install. I don't know about the conversion to long pump though but do know that they need to know short or long pump when ordering the A/C unit for the pulleys to line up. I'm pretty sure the brackets for the p/s and alternator need changed do to the pulley location changing. Since I believe cars with 350 from the mid 70's on had long pumps the brackets should be available readily in the junk yard. __________________ 66 Chevy C30 Stakebody Dump, PS,PB, 327cu in 71 Corvette Coupe 454 4 speed 69 Chevy C20 Custom Camper

07-21-2003, 05:39 AM	#3
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I think the brackets will need to be changed. Our trucks came with the short pump w/ the PS brackets mounted to the block and engine mount. with a long pump the PS bracket is mounted w/ the wp and block. The long pumps deput in late 60s in the GM cars and trucks in 73 I believe. Except w/ vettes. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

07-21-2003, 07:12 AM	#4
GMCPaul Senior Member Join Date: Mar 2000 Location: Rockville,In. USA Posts: 3,721	The brackets will need to be changed if switching to a long neck water pump as will crank & water pump pulleys. The larger 8" harmonic balancer will not affect choice of water pumps or pulleys. GMCPaul __________________ Secure Online Catalog for-GMCPauls Truck Parts Email- GMCPAULS@GMAIL.COM

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