350 pulleys question (was mis-posted in general section) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**WorkinLonghorn** · 01-30-2007, 08:36 PM

Finally started my A.C. resto prjct,bought new hoses,clamps,figured out how the brackets go on this after-market set up.But with this "rebuilt" motor the AC belt hits the fan center portion.
>> If I get a smaller front pulley I think it will clear,like it did on the orig. eng.
>> The current pulley is about 6 1/2 inches. Were there other sizes available? Or is one available after-market like the one shown here only 5 inches or so?

**WorkinLonghorn** · 01-31-2007, 11:39 AM

ttt. Anybody?

Sport/Truck · 01-31-2007, 04:51 PM

It’s supposed to go over the center water pump pulley.

s/t

**WorkinLonghorn** · 01-31-2007, 05:06 PM

On this particular after-market set-up,the compressor is on the passenger side and uses the most forward (unused in photo) pully groove.
This picture is after removing the compressor to see if there was an adjustment.Of course there wasn't.- thx. Brian

Sport/Truck · 01-31-2007, 07:10 PM

The passenger side is the stock location, normally would use the middle pulley on the crank and the outer pulley on the WP as well. You are saying it need to miss the WP pulley? LMK,
s/t

Sport/Truck · 01-31-2007, 07:47 PM

I just now got the picture?? Not sure what the deal was, but anyway….that pulley looks different from what I’ve seen. If the pulleys are all next to each other would this fix your problem?
I’m going to suggest that you list your year model, engine size and trany info in a sig line,this can speed things up.
s/t

**WorkinLonghorn** · 01-31-2007, 09:02 PM

Thanks.Here's the situation: In the picture above,the 1st (left) belt goes to the alternator via the water pump/fan.The second belt is dedicated to the ps pump.Looking at the outer pulley groove,if you imagined a belt coming out of that groove you can see that it would JUST hit the fan hub,actually it hits a little further out on the bottom of the hub. All I need is about 1/2 inch.It used to clear on the orig. motor and I can't figure out why it doesn't now.I either need to find a smaller pulley or figure out a way to reposition the compressor an inch or so outboard.Thanks-Brian

Sport/Truck · 01-31-2007, 10:34 PM

What is different with this motor, long water pump maybe?
s/t

**WorkinLonghorn** · 02-01-2007, 01:26 AM

Maybe that's it. I'll have a look-see tomorrow.

01-30-2007, 08:36 PM	#1
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,861	350 pulleys question (was mis-posted in general section) Finally started my A.C. resto prjct,bought new hoses,clamps,figured out how the brackets go on this after-market set up.But with this "rebuilt" motor the AC belt hits the fan center portion. >> If I get a smaller front pulley I think it will clear,like it did on the orig. eng. >> The current pulley is about 6 1/2 inches. Were there other sizes available? Or is one available after-market like the one shown here only 5 inches or so?

01-31-2007, 11:39 AM	#2
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,861	Re: 350 pulleys question (was mis-posted in general section) ttt. Anybody?

01-31-2007, 04:51 PM	#3
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: 350 pulleys question (was mis-posted in general section) It’s supposed to go over the center water pump pulley. s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

01-31-2007, 05:06 PM	#4
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,861	Re: 350 pulleys question (was mis-posted in general section) On this particular after-market set-up,the compressor is on the passenger side and uses the most forward (unused in photo) pully groove. This picture is after removing the compressor to see if there was an adjustment.Of course there wasn't.- thx. Brian

01-31-2007, 07:10 PM	#5
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: 350 pulleys question (was mis-posted in general section) The passenger side is the stock location, normally would use the middle pulley on the crank and the outer pulley on the WP as well. You are saying it need to miss the WP pulley? LMK, s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

01-31-2007, 07:47 PM	#6
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: 350 pulleys question (was mis-posted in general section) I just now got the picture?? Not sure what the deal was, but anyway….that pulley looks different from what I’ve seen. If the pulleys are all next to each other would this fix your problem? I’m going to suggest that you list your year model, engine size and trany info in a sig line,this can speed things up. s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. Last edited by Sport/Truck; 01-31-2007 at 07:55 PM.

01-31-2007, 09:02 PM	#7
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,861	Re: 350 pulleys question (was mis-posted in general section) Thanks.Here's the situation: In the picture above,the 1st (left) belt goes to the alternator via the water pump/fan.The second belt is dedicated to the ps pump.Looking at the outer pulley groove,if you imagined a belt coming out of that groove you can see that it would JUST hit the fan hub,actually it hits a little further out on the bottom of the hub. All I need is about 1/2 inch.It used to clear on the orig. motor and I can't figure out why it doesn't now.I either need to find a smaller pulley or figure out a way to reposition the compressor an inch or so outboard.Thanks-Brian __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.

01-31-2007, 10:34 PM	#8
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: 350 pulleys question (was mis-posted in general section) What is different with this motor, long water pump maybe? s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

02-01-2007, 01:26 AM	#9
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,861	Re: 350 pulleys question (was mis-posted in general section) Maybe that's it. I'll have a look-see tomorrow. __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.

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