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Old 11-18-2009, 04:32 PM
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correct pump and pulleys for a BBC 6-71 blower

Hey guys, we're knee deep in this 6-71 blower project for the 468 BBC. Today we set it on the engine and eyeballed the pulleys. The blower drive pulleys will line up correctly, but the Vee belts are way off. I'm thinking there must be a shorter water pump and pulleys available somewhere. What are you guys using for the water pump and water pump pulley and the power steering pulley, it's way off also.

This is in a 1986 pickup.

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Old 11-18-2009, 07:15 PM
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I'm not a BB guy, but sure they come with long and short water pumps like a small block. For my alternator and power steering I found some ZOOPS adjustable brackets that allowed in and out movement. Rather than use their high mount for the alternator, I used parts from two mounts, flipped them upside down, inside out, whatever it took to lower the alternator. They have all sorts of brackets.

Billet Specialties to as well.
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Old 11-18-2009, 09:34 PM
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I'm not really a big block guy either but I have done 3 BBC with 6-71's and the water pumps were not a problem. Maybe I just got lucky. It's possible you need a different snout on the blower or a different crank hub. There are at least 8 different lengths and several styles.

Is it a stock GMC 6-71 or aftermarket rebuild or billet.?? To get the right ratio you will need to give more info on your motor and intended use and what kind of blower drive and manifold you have. 6-10 pounds of boost is about it for street. Even then you need a low compression build or you can run E-85 gas.
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Old 11-18-2009, 11:08 PM
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It's a BDS 6-71 and we already know we are starting out with a 9% under drive.

I was just hoping for some one who could lead us to the correct water pump, power steering pump pulley, alternator bracket.
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Old 11-18-2009, 11:56 PM
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I searched Summit and came up with these dimensions:
short pump---5.80
long pump----7.20

These are from the block surface to the face of the hub. I wasn't aware that there were long and short pumps so I don't know what they came on. My guess would be that the short pumps come on the older BBC without AC. I would think that the blower drive would use the short pump the same as the SBC does. Allan Grove makes all kinds of brackets.

Whatta ya know he has stuff for both long and short pumps. I learned something today.

http://www.alangrovecomponents.com/Catalog.htm
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Old 12-03-2009, 08:06 AM
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I had the same problem. Hot Rod mag had an article about old school blowers and had a pic of one. It had a short pump on it. Problem solved.
Make sure you post how things are going as you build. I am having carb trouble. Hoping someone else has already solved the same high idle problem I am having.
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Old 12-04-2009, 11:25 AM
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Quote:
Originally Posted by msggator
I had the same problem. Hot Rod mag had an article about old school blowers and had a pic of one. It had a short pump on it. Problem solved.
Make sure you post how things are going as you build. I am having carb trouble. Hoping someone else has already solved the same high idle problem I am having.
We still have yet to find a decent mount for the alt. on the pass. side. I think we are going to make it ourself.
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Old 12-04-2009, 01:02 PM
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I took a ZOOPS high mount bracket, flipped it over and put an "L" bracket underneath to the head, and an adjuster to the water pump, works good. Had some minor clearance issues with the valve cover too close, but easily fixed that. Just an idea for you. Not great pics but you get the idea.
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Old 12-05-2009, 01:19 AM
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The older 1968 and back BBC's use the short style water pump and drivers side mounted alternator. Most of the 6-71 8-71 pulley/crank hub drive arrangements use this architecture.
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Old 12-05-2009, 01:33 AM
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Check here for brackets. If he hasn't got it exact there is probably one that can be modified.

http://www.alangrovecomponents.com/B...Short_Pump.htm
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Old 12-06-2009, 05:49 PM
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Quote:
Originally Posted by F-BIRD'88
The older 1968 and back BBC's use the short style water pump and drivers side mounted alternator. Most of the 6-71 8-71 pulley/crank hub drive arrangements use this architecture.
Right you are but the power steering pump is on the drivers side on this truck.
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Old 12-06-2009, 05:57 PM
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Quote:
Originally Posted by Overdriv
Right you are but the power steering pump is on the drivers side on this truck.
The stock GM pre 1969 power steering pump was also on the drivers side.

It's a bit different than the later 1969 up pump. it has a remote fluid resevoir that mounted to the inner fender/rad support on the drivers side.

Common on 1968 and back chevelles Impala and trucks.
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Old 12-10-2009, 04:53 PM
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Quote:
Originally Posted by 68NovaSS
I took a ZOOPS high mount bracket, flipped it over and put an "L" bracket underneath to the head, and an adjuster to the water pump, works good. Had some minor clearance issues with the valve cover too close, but easily fixed that. Just an idea for you. Not great pics but you get the idea.
68NovaSS, it's hard to tell what the alt. bracket is mounted too. Can you elaborate on your alternator mount for me? Thanks.
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Old 12-10-2009, 05:36 PM
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It's a ZOOPS bracket, turned upside down. Here's a picture of the bracket adn some additional pics of the bracket. The tip of it bolts to the head neat the water pump, the "L" bracket bolts to two additional holes already in the bracket and to holes in the head front as well. I didn't drill any holes in the heads, all were existing on Dart heads. I did drill the "L" bracket mounting holes the rest of the way through the mount flat part, use sleeves to raise it some and lock nuts to hold them and the brakets on.

The only clearance issue is at the valve cover, I needed to shave some off the engine side of the bracket to clear the cover end. The adjustment arm works off the ZOOPS flat "C" shaped arm that connects to the bottom of the alternator, kind of wraps around it, then over to a water pump bolt.

I see mention above of the PS pump mount, I used a ZOOPS adjustable mount for that, picture attached of the bracket. Mounts low on the drivers side and is adjustable to ease alignment of the pullys.


http://www.zoops.com/appguides_prodmount.asp
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