March Underdrive Vs. Charging
 

Has anybody experienced any significant voltage drops when running the March 2 pc (crank / alt) underdrive set on the LT1? i.e. 12.6v stock compared to after underdrive install.

A part number for the belt would also be much appreciated.

regarding part MCH-4485

Running the LT1 underdrive pulley. Napa has all of the 6 rib "A" section belts. I have alot of mods. The stock alt has been holding 13.4 volts @ approx 1500 rpm.
Running...
electric WP.
electric vac pump.
Acceleronics inj driver for 72# Siemens 4/1 amp.
elctric H2o/ meth injection
2 walbro 255 lph pumps.
KB BAP electric driver on pump #1.
2 hi-flo fans.
Wideban O2 dynojet.
(97ss - 383 - D1) Hope this helps.