i got a unorthadox single drive pulley.. it is a little smaller diameter than oem for the alternator.. just wondering if that makes a difference.. especially for the timing marks

 

i searched.. anybody

 

Its an underdrive pulley so that's why the grooves for the alternator has a smaller diameter. It won't harm timing since marks on the timing aren't affected by radius length but improper position will affect timing.

 

ok the underdrive makes sense now... basically it will turn the alternator easier or something like that.. it has a key to go on the crankshaft so it would be really hard to put it on wrong.. thanks for the help man