PS Pulley size/belt 390 FE

[fordman]

you could have ditched the second alt belt and set it up that way. there is no 4th pulley used on these trucks ever. with or without any kind of a/c. but i guess you haev it working now.

[Mach428]

You may have a problem with the AC compressor lining up with the 4th sheave as it is supposed to run from the 3rd. I used the 7AA pulley and the water pump suction hose (bottom) is very close (1/4") to the first belt but it doesn't touch.

[70_F100]

Mapco is a company that used to manufacture compressor mounts and pulleys for add-on air.

[rjewkes]

is this right? the alt is supposed to run closest to the engine? then the ps and finally the a/c?

[fordman]

yes in that order.

[sharness]

Do any of the water pump pulleys for a 390 have wider spacing.My c6ae-5809-a is to narrow, the front groove won't line up with crank groove.Groove in w/p pulley needs to be about a half inch forward.

[HIO Silver]

I ended up stacking washers behind the PS bracket to get the pulley lined up. However, I researched this issue and 70 and earlier rigs used a different bracket than 71 and later models. That may explain why mine needed spacers when the PO (previous owner) retrofitted PS to my rig.