i took my air pump off befor i droped the motor in my truck and im using a v6 belt on the motor now...seems to work great! but i just got soem underdrive pulleys and im not sure what size belt to get when i dont have a air pump so im lookin for a pulley to put back in place of my air pump!! or what size belt do i need for underdrive pulleys and no air pump...on a 91 z28 motor!! thanks

 

you can get any length belt you want at any parts store.,

simple

good luck

 

take a look at an 89 tBI 5.7 full size Balzer/Jimmy setup for belt routing
March also sells under drive pulleys for that, and would probably list the belt too

you dont really need the pulley if you route the belt

 

the vans too

a friend of mine just took a 92 ful size 2500 gmc van with 5.7L TBI to shredder friday or saturday,
ran good even, had the later true serpentine on it with aluminum brackets, the good stuff, and smog delete

shredder, gone

good luck