Belt size. Please help
 

Anyone know the belt size for a 91 Ford mustang LX without Air pump assembly and with A/C, and underdrive pulleys. THank you I really could use a hand on this...

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91 LX Convertible Gray on Red B&M Shift improver kit,ASP red alum. underdrive pulleys, Richmond 3.73 gears, 1 5/8 Flowtech long tube Headers and off road h-pipe, Flowmaster 2-chamber cat-back with S.S exhaust, MSD 6A Ignition with coil,Cap and rotor, Taylor Pro wires, K&N 12" conical filter system, Jet stage 2 performance chip,GT40 P heads, looking at new exhaust, Lentech Street Terminator plus.

take a string and route it the way the belt will go and then get your measurement from that. should put you within a 1/4 inch of where you need to be.
this is what everyone will tell you.
dont forget to consider the tensioner pulley. that should take any slack out of it but dont measure around it when it is in the fully upright (non tensioned) position!
Q

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Quin, 87 GT,306,forged/cut pistons,edelbrock head\intake,steeda#18cam,1.7rr,MSD Blaster tfi coil,A9L,pro-m75mm,24#inj,accufab65mm,2.5"pipes,hooker headers,dynomax exhaust,3.73 gr,110 lph fp,moroso cold air,ASP pullies, weld rims

See my engine on user rides.

I see your shwartz is as big as mine, now lets see how well you handle it!