Re: Part number conversion?
 

487331 is discontinued, no replacement shown in my parts history catalog dated 1990

I have an old Parts History Catalog if anyone is interested in it.

Covers Chev-Pontiac-Buick-Olds-Cadillac
Jan 1, 1982 thru Nov 30, 1990.

Contact me for more info

Re: Part number conversion?
 

I found some Pontiac books that show no superceded # for this part# in group 3.278..but I contacted a Pontiac "expert" of sorts and showed him your picture.
He suggested trying either part #478415 which is 1&3/4 inches long,or part #492028,which is 2&1/2 inches long.
There is another that might work,part #478417,but this is with cruise control.
These are all Pontiac #'s,and all have different measurements and angles,but he said search for them as their differences are minor and may work for your application.
Hope this helps.

Re: Part number conversion?
 

Thanks for the assistance. I managed to find one on the Performance Years forum and I should get it in the next week or so. He had the exact one for my car in his toolbox!

Re: Part number conversion?
 

Is there a book or some other reference available for doing the part number cross reference? I am trying to see if there is a current GM replacement number for 3906656 which is a water pump pulley for a 68 L78. Thank you.

Re: Part number conversion?
 

Bill,the part#3906656 pulley was discontinued 09-2002 with no supersession to a new number.GM shows it last fitting a 66-67 Corvette 427 w/o a/c.Hope that helps.Its nice having a GM computer sitting in front of you to help people out.One of the perks of working at a dealership.
Kendall