Z-codes ?

[Culvers]

Hello,

what are the Z-codes? Special Equipment Weight, from minus 320 (Z23) to plus 320 (Z37). But what does it means?

Culvers

[Alaskan_TA]

Those codes were not in use until 1977, but I am not aware of the exact meanings.

Barry

[Chryco Psycho]

Or you own a GM trhey all have Z codes ......makes them Special 

[Stacked440]

Fifth Digit - Engine
A=170 CID, 6 Cylinder (1 bbl Carb)
B=198 CID, 6 Cylinder (1 bbl Carb)
B=225 CID, 6 Cylinder (1 bbl Carb)
C=225 CID, 6 Cylinder (Special Order)
D=273 CID, 8 Cylinder (2 bbl Carb)
E=225 CID, 6 Cylinder (Special Order)
F=318 CID, 8 Cylinder (2 bbl Carb)
G=318 CID, V8 (2 bbl Carb)
H=340 CID, V8 (4 bbl Carb) HP
H=383 CID, V8 (4 bbl Carb) HP
J=426 CID, V8 (HEMI) (1966 - 1969)
J=340 CID, V8 (3-2 bbl Carb) (1970)
K=440 CID, V8 (4 bbl Carb) (66-69)
K=360 CID, V8 (2 bbl Carb) (70-71)
L=383 CID, V8 (2 bbl Carb) (1970- 71)
L=440 CID, V8 (2 bbl Carb) (67-69)
M=440 CID, V8 (3-2 bbl Carb) (69)
M=440 CID, V* (4 bbl Carb) (69)
M=400 CID, V8 (4 bbl Carb) (71)
N=383 CID, V8 (4 bbl Carb) (1970 - 1971)
R=426 CID, V8 (HEMI) (1970 - 1971)
T=440 CID, V8 (4 bbl Carb)
U=440 CID, V8 (4 bbl Carb) HP
V=440 CID, V8 (3-2 bbl Carb) (1970-1971)HP
Z=Special Order, V8

Special order only available after 77?

[Alaskan_TA]

Z is a legitimate engine code, but he was asking about Z23, Z37 and the codes in between. 

Barry