3g belt length

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Your belt length shouldn't be any different than what's on there now. a 2.75" alternator pulley diameter is close enough to stock that it isn't going to change the length of the belt any. There should be more than enough slack in the tensioner to take it up? Have you made any other changes? Underdrive pulleys? A/C, or smog pump delete?
 
Don't add any more than 1/2"-1" to your belt length. If you go "2+ inches, I guarantee that your tensioner won't take up the slack. You want that sucker nice n tight.

Also....different manufacturers belts will vary in length....even if they're stated to be the same. I'd buy a couple of each and keep the one that fits best. Remember....don't run the car with the belt on, unless you plan on keeping it. They may not allow you to return it if they see signs of use.