10
901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 10 OF 24
OEM Holes
(Enlarge to 1
¼
”
if Necessary)
Enlarge
to 5/8”
Figure 7
Figure 8
OEM Foam
Insulation
OEM Foam
Insulation
(4) Large
Grommets
33137-VUI
Cut and
Remove
View From
Passenger Side
Inside of Cab
View From
Passenger Side
Inside of Cab
13
½
”
8
½
”
Firewall Modification
Drill (2) 1 ¼” holes and (2) 3/8” holes into the firewall (See Figure 7, below).
Enlarge an OEM hole in the firewall to 5/8” as shown in Figure 7, below.
1.
2.
Firewall Modification (Cont.)
Cut & remove the OEM foam insulation as shown in Figure 8, below.
Install (4) large grommets as shown in Figure 8, below.
1.
2.
Drill
1¼” Hole
OEM
Hole
5
5/16
”
7
1/16
”
4
27/32
”
4
⅝
”
10”
OEM
Hole
Drill
3/8” Hole
55-59 Chevy Pickup
Firewall Indention
(Engine Side)
Factory
Stamp
Factory
Stamp
Factory
Stamp
OEM
Hole
Drill
3/8” Hole
15/16”
2
27/32
”
