#1  
Old 04-16-2011, 05:31 PM
CanAmT/AGTO CanAmT/AGTO is offline
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Default 70 GTO Water Pump Pulley

I have several water pump pulleys and don't remember which is the right one for my car. Not a numbers matching engine but is a 70 date code 400 engine and is ready to install but this project has taken about 4 years. Here are the #'s on the pulleys I have ;
481039-XF 8" diameter (This is the one I think was on it).
9799127-XF 8" diameter(Think this is for my 71 455)
481040XT 6 1/2" diameter.
and lastly a 7" diameter pulley with zero numbers on it.

Thanks in advance. Any help would be appreciated

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  #2  
Old 04-16-2011, 06:01 PM
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gtoformula gtoformula is offline
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Location: Double Oak, TX
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I didn't grab the GTO Restoration Guide, but I recall that a car with AC has a crank pulley that is larger than the WP pulley (8"?). The WP pulley might be 6 1/2" for the AC car. For a non AC car the diameters were reversed. Seems that Pontiac wanted coolant flow to be higher for AC cars. I have a non AC 1970 with a 400 and am running the AC style pulleys with the larger pulley on the crank and the smaller pulley on the WP.

  #3  
Old 04-16-2011, 06:22 PM
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poncho447 poncho447 is online now
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Quote:
Originally Posted by CanAmT/AGTO View Post
I have several water pump pulleys and don't remember which is the right one for my car. Not a numbers matching engine but is a 70 date code 400 engine and is ready to install but this project has taken about 4 years. Here are the #'s on the pulleys I have ;
481039-XF 8" diameter (This is the one I think was on it).
9799127-XF 8" diameter(Think this is for my 71 455)
481040XT 6 1/2" diameter.
and lastly a 7" diameter pulley with zero numbers on it.

Thanks in advance. Any help would be appreciated
The 9799127 is your 70 pulley, fits 69-70 without a/c. The 481039 is 71-up without a/c and the 481040 is 71-up with a/c.

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