Got some used LT1 March underdrive pulleys.
I have the main pulley and the altonator pulley.

I know I need a shorter belt but I dont know what size.
Who knows the right length?

Thanks

 

I need to know this info as well!
Thanks

 

If someone can give me the circumfrence of the stock crank and ALT pulley I can do the math.

 

25 inch belt

 

You're kidding right?
I don't know what size he needs but do know it can't be 25 inch..
It has to be close to 61 or so..

 

I definitely agree it must be longer.
He might be referring to if you pull it taught it would measure 50"

 

i have the march under drive crank/ overdrive alternator pullies, and my car has no ac. i ended up swapping belts at the store for a while till i just took a piece of string and routed it the way the belt goes and took a little off for the tensioner.

the one i use came out to be "21mm X 1485mm" ~about 58.46 inches

this is with 1le AC delete pully and Overdrive alternator