Vortech 1996-2000 5.7L Vortec Truck/SUV User Manual

Page 9

P/N: 4GM020-010

14AUG00 V 1.2

(Vortec 350-2 )4GM

OIL DRAIN

A. To provide an oil drain for the supercharger,

it is necessary to make a hole in the oil pan.
Locate and mark hole (see

Fig. 2-a

). It is best

to punch the hole rather than drill.

B. Remove the two factory anti-roll bar brack-

ets from the frame and allow the bar to
temporarily drop down. Unplug the factory
crank trigger connector from the sensor
located in the timing cover.

C. Remove paint around the hole area.
D. Use a small center punch to perforate the

pan and expand hole, switch to a larger
diameter punch and expand the hole further
to approximately 9/16" diameter. Most
punches are made from hexagon material
and may be placed in a socket with an
extension to make this procedure easier.
Use caution so that the hole is not enlarged
too much and punch does not contact the
crankshaft.

COMPONENT REMOVAL

A. Disconnect the negative battery cable from the

battery.

B. Remove and set aside the following components:

- The entire air inlet/filter box assembly, including the

throttle body resonator.

- The crankcase vent tube from the right side

(passenger) valve cover.

- The accessory drive belt.
- The tensioner and idler from the alternator mount-

ing bracket.

- The alternator and bracket.
- The 3/8" stud protruding from the right side cylinder

head.

C. Drain approximately one gallon of coolant from

the radiator into a clean container.

D. Remove the formed section of rubber/aluminum

hose running from the water pump to the heater
core hose. (See

Fig. 1-a

.) The heater core hose will

be reconnected to a new hose in step 9.

REMOVE TUBE

FROM VEHICLE

PUNCH HOLE
THROUGH
(DIRECTLY
UNDERNEATH
CORNER PAN
BOLT)

HOLE MUST BE
MADE FROM THE
SIDE OF
THE PAN

OIL PAN BOLTS

FRONT VIEW

2-1/2"

BOTTOM VIEW

NOTE: Removal of the oil pan may

ease oil drain fitting installa-
tion on some applications.

Fig. 1-a

NOTE: The factory transmission

cooler lines may require
bending to clear the super-
charger oil drain hose.

Fig. 2-a