Water Pump/A.I.R. Pulley? - NCRS Discussion Boards

Water Pump/A.I.R. Pulley?

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  • Dennis M.
    Very Frequent User
    • April 30, 1988
    • 160
    #1

    Water Pump/A.I.R. Pulley?

    On my '68 300 hp Auto with power steering, pulley arrangement, which was missing the A.I.R. stuff. I was referring to the assembly manual with regards to the correct pulley for the water pump. When installing the various belts and having all installed except for the A.I.R. belt, I realized that I did not have anywhere to put it. The water pump pulley on this engine (#3900434)is only two grooved, I would need three grooves to drive the A.I.R. pump. Now the assembly manual shows a 2 groove pulley #3890419 with a supplemented single pulley #3883235 in front of the two groove pulley. Thus having three grooves. Now the question is the 2 + 1 arrangement correct or something else. I checked my older GM Corvette parts book and found that for a '68 327 w/power steering and A.I.R. the number 3900434. If someone has this arrangement, what are the pulleys numbers?
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    • Mark G.
      Very Frequent User
      • March 1, 2001
      • 227
      #2
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        • Kevin Whiteley
          #3
          Re: Water Pump/A.I.R. Pulley?

          Dennis,

          I can't provide you with any part numbers, but I think the 2+1 arrangement is correct. If you search the Archives (link at top) and enter the 7 digit part number, you will find a wealth of information on the correct application for each. Look specifically for posts by Joe Lucia. Hope this helps.
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            • Joe L.
              Beyond Control Poster
              • February 1, 1988
              • 43193
              #4
              Re: Water Pump/A.I.R. Pulley?

              Dennis------

              ALL 1968 Corvette small blocks used a"sandwiched" pulley arrangement on the waterpump. The rear pulley was a 2 groove pulley and the forward pulley was a 1 groove pulley. The 3883235 is the correct pulley for the front, single groove AIR drive pulley. As I recall, the rear, 2 groove pulley was GM #3890419 as you have found in the literature. It's possible, though, that the 3900434 was an alternate. I'll have to check later; my reference library is 3000 miles away.
              In Appreciation of John Hinckley
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                • Chuck R.
                  Expired
                  • April 30, 1999
                  • 1434
                  #5
                  Re: Hey Joe, hows the Labsta?

                  Your tromping around in my home state. Gotta love those seasonal prices huh?.....OUCH!

                  Ooh and the smell of those clam flats, Ahhhhhhhhhh. Need a good NIOSH resperator of those over 75 degree days.

                  Hope the weather is still cooperating for you.

                  Regards,

                  Chuck
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