Chevrolet 1973 Overhaul Manual page 462

The following procedure should be followed before making
any trim height measurement.
1. "Z" Dimension
a. Lift vehicle up approximately 1-1/2" at the front
bumper and gently remove hands allowing vehicle to
settle on its own. Repeat this lifting operation twice.
Measure the "Z" height in the settled position after the
third lift.
b. Push vehicle down approximately 1-1/2" at the front
bumper and gently remove hands allowing vehicle to
settle on its own. Repeat this pushing down operation
twice. Measure the "Z" height in the settled position
after the third push down.
c. The true "Z" height is the average of (a) and (b) for
each side.
DIMENSIONS " Z " , "J", " K " & " D " V ER TIC A L TO GROUND AND APPLY
CHEVROLET MODELS
WITH STANDARD V-8
SEDANS WITH L-6 ENG.
Wagon (125" W.B.)
A ll Sedan With LS4
CHEVELLE MODELS
Sedans
A ll inc. w/F-40
Coupe
SS Coupe
Pick-Up
SS Pick-Up
Wagon
MONTE CARLO
CAMARO MODELS
Base
Z-28
NOVA MODELS
N O T E : Good judgement should be exercised before replacing a spring when the trim height is only slightly out of specification.
The normal allowable tolerance is+ 3/4".
TRIM HEIGHTS
TO REG. PROD. W ITH P/S, P/B AND RADIO
TIRES CURB
G-78
G-78
L-78
H-78
E-78
G-78
E-78
G-78
G-70
G-78
G-70
H-78
G-78
GR-70
A ll
A ll
E-78
E-70
2. "D" Dimension
NOTE: Follow the same pattern as stated above for
the "Z" dimension when measuring the "D"
dimension except: Lift and push on the rear
bumper.
3. "J" & "K" Dimensions
a. Jostle the front of the car up and down three times
by lifting the vehicle up approximately 1-1/2" at the
front bumper and immediately push vehicle down
approximately 3" from the raised position raising up
3" and repeating the cycle a total of three times.
b. Jostle the rear of the car three times by applying the
same procedure to the rear bumper as used on the
front in (3a).
c. Repeat the jostling of front a second time.
d. Measure the "J" and "K" dimensions in the settled
position.
z J
CURB
9.69
3.13
9.72
2.90 10.22
3.13 10.01
2.42
10.36
2.02
2.40
10.36
2.00
2.00 10.28
10.50
2.05
10.42
2.19 10.97
10.55
1.68
10.03
1.82 7.97
9.12
2.69
9.76
2.18
9.52
SPECIFICATIONS 3
K D
CURB CURB
9.67
6.24
9.69
5.74
10.22
9.98 6.24
5.47
10.41
5.07
5.45
10.40
5.05
10.32 5.05
10.72
4.61
10.64
11.02 4.65
10.71
5.03
10.19
7.55 5.83
8.84 6.97
9.80
5.54
9.55
OVERHAUL MANUAL