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07-19-2011, 12:31 PM
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#1
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Join Date: Oct 2008
Location: Edison
Posts: 211
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Checking the offset on a pulley
I'm trying to figure out how to "properly" figure out the offset on my water pump pulley. Some one had said to flip it upside down on a flat table and measure from the table to the middle of each groove.
Also does any one have a pulley that may fit? or know some where I may be able to find it?
I need a 5 3/4" - 6" diameter pulley
Offset (using the above way of figuring out the offset)
1" from the table to the center of the first groove 1 5/8" from the table to the middle of the second groove.
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1968 Firebird: Pontiac 350ci, Muncie M20, front disk brakes w/ adj. proportioning valve, white (for now) w/ black interior.
1978 Corvette: 350 H.O., Muncie M21, all available options.
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07-19-2011, 01:10 PM
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#2
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Can you use a wire brush and some white paint to lift a GM part number?
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07-19-2011, 01:29 PM
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#3
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Join Date: Oct 2008
Location: Edison
Posts: 211
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I can probably get something off it after work
My problem is it's 8" and I need a 5 3/4" - 6" one
__________________
1968 Firebird: Pontiac 350ci, Muncie M20, front disk brakes w/ adj. proportioning valve, white (for now) w/ black interior.
1978 Corvette: 350 H.O., Muncie M21, all available options.
Last edited by 68bird; 07-19-2011 at 01:30 PM.
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07-20-2011, 04:11 PM
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#4
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Join Date: Oct 2008
Location: Edison
Posts: 211
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I just checked it and right off the bat I know it's not the right pulley
The part # on the front says
XF 3786819
I looked on-line and I think the pulley I'm looking for is 9796061
__________________
1968 Firebird: Pontiac 350ci, Muncie M20, front disk brakes w/ adj. proportioning valve, white (for now) w/ black interior.
1978 Corvette: 350 H.O., Muncie M21, all available options.
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07-20-2011, 04:19 PM
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#5
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Does your car have power steering? And what year is your motor? I do not recall.
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07-20-2011, 04:35 PM
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#6
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Join Date: Oct 2008
Location: Edison
Posts: 211
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Yes it has power steering and it's a '68 400 (we think, if not it's a 350) block with an 8-bolt water pump.
64-68 Firebird's and GTO's with 350-400's were what they were put on.
__________________
1968 Firebird: Pontiac 350ci, Muncie M20, front disk brakes w/ adj. proportioning valve, white (for now) w/ black interior.
1978 Corvette: 350 H.O., Muncie M21, all available options.
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07-21-2011, 06:18 PM
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#7
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Join Date: Oct 2008
Location: Edison
Posts: 211
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Some one is taking my pulley and a smaller pulley, cutting the offset and welding mine to the smaller one. He's done it numerous times and it seems to work.
__________________
1968 Firebird: Pontiac 350ci, Muncie M20, front disk brakes w/ adj. proportioning valve, white (for now) w/ black interior.
1978 Corvette: 350 H.O., Muncie M21, all available options.
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07-21-2011, 08:13 PM
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#8
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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Huh, that's one I never heard of. Is it that hard to get the right one?
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Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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