Do a search for underdrive pulleys. There are several places they can be purchased and aluminum ones will give you a little more bang for the buck. Three vendors that come to mind are SCI, SCP and ASP. Not sure if March still offers them.hawk said:Hey guys, can someone tell me the best type , size and place to buy the underdrive pully set. Also what size MAF came on the 89 t/bird and whats the best size to get with out changing injecters.
hawk
I don't understand how you didn't see a gain, but maybe you didn't notice it. UD pulleys were one of my bigger bang-for-the-buck mods on my car. But like you said, an overdrive jackshaft is nice.Randy N Connie said:I notice no gain in horse power when I installed underdrive pullies.
I did get small amount of gain in horse power from the over drive
to the jackshaft on my under drive chankshaft pulley.
I would spend my money some where else than on underdrive pullies.
Unless you able to find underdrive pulley set with a overdrive
crankshaft to jackshaft pulley.
RANDY
Confirmative - 55 mm MAF with 30lb injecors.the-big-e said:I think stock is 55mm MAF with 32# injectors......
A couple of weeks ago I suggested a 2 piece crank pulley to Charles Warner of MP. Stock OR 10% Crank - JS pulley, and Stock OR Underdrive serpentine pulley. Could mix & match what you want.Randy N Connie said:Unless you able to find underdrive pulley set with a overdrive crankshaft to jackshaft pulley. RANDY