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agreeing with andym! we've talked about this before and bypassing won't help in the least! save yourself the $20 on the belt and spend it on another upgrade...
Me, too I'd like to go with the shorter belt on my 1993 F250 with 351, 5spd 4x4 -NO A/C. I figure bypassing the air pump may pick ip a little power and help my fuel milage
not even a little itty bitty bit of difference in either.
kdy7201 said he's going to dig it out and give us the number. You can also take some string or something and run around the pulley's and take that measurement to autoparts store. I think the belts come in one inch increments.
I'll I dig it out tomorrow work schedule is crazy right now an internet was down yesterday so couldn't post it didn't wight the number down at work sorry you guy I'll get it as soon as I get home
pretty shure its for the 460 only. the 460 uses a twin serpitine system 1 for alt, smog pump , water pump & fan, the other is for ps, ac ,water pump, and fan and pretty shure the 351w use a single longer belt for all