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Re: 6 cyl P/S I.D. and value?
Judging by that waterpump pulley Eric, I'd say that is one of the late 70's / early 80's setup's.
Somewhere around 75, GM changed the spacing on the L6 pulleys making them wider than the ones on our trucks. If you also get the harmonic balancer from that setup, then you can back-date the 67-72 L6's with no issues. Always a good score though!
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passthebuck 
#5642
-TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4.
-a 2013 Honda Civic as my "sensible" car
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