Just ordered a 3 piece set March Performance Pulleys. I still have all accessories in the engine. What lenght serpentine belt will I need to replace the stock one.

 

91 inches

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89 iroc 5.7 can't go fast enough. 14.1
TPIS sucks (except for mini-ram, shocks,struts, and modified maf)

[URL=http://www.picturetrail.com/irocsean[/url]

 

Thanks

 

Well, I appreciate IROCTPIS's input but the 91 inch belt was a little too short for my engine. For others who might want to change their pulleys to March Performance 3 Piece Set, and you have all accessories in the car like A.I.R., AC, PS, Alt. and Water Pump of course, then a 95 inch belt is what you need. Now this is for an 88, so it might be different for other year models.
Now that the pulleys are in here is what I have noticed. The car runs about the same but there is a voltage swing at idle. It does not go into the red but it still maintains about 11.6 Volts. The car is an automatic so the idle voltage will be different on a standard since your idle will be a little higher. During normal operation the voltage does return back to well above 12 Volts. March recomends you increase idle speed if the voltmeter does fall into the red.
As far as power increase it is very small but noticeable, and with a slight increase in fuel economy.:-)

 

What lenght do I need for 2.8l without AC ?

 

i was thinking about getting a set from summit. how long is the stock belt do you know? thanks for posting this though now i know for sure what belt size i need.