P/N: 4GC020-010
©2001 Vortech Engineering, LLC
All Rights Reserved, Intl. Copr. Secured
15SEP01 V1.1
(88-95 GM Lt Trk(4GC))
1. COMPONENT REMOVAL
A. Disconnect the battery (negative lead).
B. Remove and set aside the following compo-
nents:
• The top portion of the fan shroud
• The accessory drive belt
• The cooling fan assembly
• The crankshaft pulley
• The air filter canister assembly and hose
• The intake air resonator (detach from inner
fender)
• The power steering pump pulley (1994
models only)
2. CRANKSHAFT PULLEY INSTALLATION
A. Remove the crankshaft pulley from the engine if
not already done.
B. Place the Vortech provided crank pulley and
spacer inside the stock pulley. (See
Fig. 2-a
.)
C. Line up bolt holes and, if necessary, press
pieces together or pull them together by gradu-
ally tightening the bolts.
D. Reinstall the pulleys as a unit onto the crank-
shaft balancer assembly using three 3/8-24 x 4"
bolts and supplied 1/2-20 x 4" center bolt. (See
Fig. 2-a
.)
3 BOLTS: 3/8-24 X 4"
SPACER
NEW ADDITIONAL PULLEY
1
NOTE: If the vehicle is a 1993 model year or later,
it will be necessary to purchase the stock
air inlet resonator. The Chevrolet part num-
ber is 25097949
Fig. 2-a
