Vortech 1994-1995 7.4L TBI Truck/SUV User Manual

Page 21

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P/N:

4GC020-010

©2001 Vortech Engineering, LLC

All Rights Reserved, Intl. Copr. Secured

15SEP01 V1.1

(88-95 GM Lt Trk(4GC))

10. DISCHARGE PLENUM

A. Thread the supplied 90

°

plastic fitting into the

3/4 NPT bung located on the discharge plenum.
(The fitting should be screwed in until snug,
pointing down & to the right at approximately a
45

°

angle.)

B. Attach the discharge tube between the plenum

and supercharger with blue sleeves; secure
with clamps as shown.

C. Install the short 1" hose piece onto the 90

°

fitting

with hose clamps. Attach the supercharger by-
pass valve (vacuum pointing toward the outside
of vehicle) to the short hose.

D. The discharge of the bypass may either be

routed to atmosphere by using the supplied 1"
K&N

®

filter (This installation will produce some

air noise on deceleration), or back to the super-
charger air inlet tube by using the supplied 1" x
10" hose and 3/4" NPT x 1" plastic fitting. If
routing the air bypass back to the supercharger
inlet:

Mock-up the steel supercharger inlet tube into

its approximate final location.

Center punch and drill a 59/64" hole into the

inlet tube and thread with a 3/4" NPT tap. (See
Fig. 10-a for hole position.)

Thread with the supplied 3/4" NPT x 1" plastic

hose barb into the air inlet tube. Connect the
long length of 1" hose from the bypass to the
air inlet.

E. Connect a vacuum hose to the bypass valve and

a vacuum source.

F. Connect the 5/32" vacuum hose between the

small fitting on the side of the discharge plenum
and the TEE that feeds the pressure normaliz-
ing holes in the spacer block (see Fig. 5-a on
page 5).

Backside of Inlet Tube (Installed)

1-7/8"

Backside of Plenum

Approx.
Center
(Vertically)

Drill:

Tap:
(optional)

59/64"

3/4" NPT

Supercharger
Bypass Valve

Fig. 10-a

11

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