Vortech 1994-1995 7.4L TBI Truck/SUV - Manual (Page 22)

P/N: 4GC020-010
©2001 Vortech Engineering, LLC
All Rights Reserved, Intl. Copr. Secured
15SEP01 V1.1
(88-95 GM Lt Trk(4GC))
11. AIR FILTER, INLET DUCT AND PLENUM
A. Modify the stock resonator chamber by cutting
off the end at the point where the radius stops.
(See
Fig. 11-a.)
B. Remove the internal baffle tube and deburr the
cut edge.
C. Fit the new end cover, with the air filter element
provided, over the end of the modified resona-
tor. Secure the cover end by drilling two 3/32"
holes (transfer the location from the cover)
and fasten with the self-tapping screws pro-
vided.
D. Peel off the protective adhesive cover and
place the plenum gasket on the throttle body
adhesive side down. Lower the discharge ple-
num on top of the throttle body and secure with
the two acorn nuts and washers provided.
E. Secure the inlet tube to the two bosses on the
front of the plenum with the two 5/16" x 3/4"
fasteners. On some models, the dashpot as-
sembly interferes with the tube. Two spacers
have been provided to correctly position the
inlet.
F. Connect the inlet elbow to the supercharger
inlet using the blue sleeve and clamps pro-
vided.
G. Connect the inlet tube and elbow together with
the 3-1/2" diameter flex tube and clamps.
H. Connect the new air filter end cover to the inlet
tube with the 3-1/2" diameter flex tube and
clamps.
I. Attach the crankcase vent from the right valve
cover to the fitting on the inlet tube. Slight
trimming of the plastic vent may be necessary.
CUT OFF END AT
END OF RADIUS
STOCK RESONATOR
VORTECH FILTER AND
END COVER
NOTE: On model years 1993 and later, it will be
necessary to replace the resonator unit
with the earlier type prior to modifying.
The Chevrolet part number is 25097949.
NOTE: Do not overtighten nuts or the ple-
num will be damaged.
12
Fig. 11-a