ive been hunting down the right belt sizes for the ILGPC I/C
3.0=680
2.8=680 or the next size smaller
685 is too big for 3.0 pulley, it just Barely holds tight enough to spin the pulley. I did get 10 psi with that belt, but its not right. The 680 is perfect size(not to tight, not to loose.) Now I have to see how the 680 works for the 2.8, it will just barely work, or not at all.
btw, the bolts you will need are 8mm x 1.25 x 90
hths
3.0=680
2.8=680 or the next size smaller
685 is too big for 3.0 pulley, it just Barely holds tight enough to spin the pulley. I did get 10 psi with that belt, but its not right. The 680 is perfect size(not to tight, not to loose.) Now I have to see how the 680 works for the 2.8, it will just barely work, or not at all.
btw, the bolts you will need are 8mm x 1.25 x 90
hths