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1972 Firebird Engines
RPO Code
UPC Code
Type
Source
Displ cid
Bore & Stroke
Carb
Comp
HP/RPM Net
Torque/RPM
VIN
Engine Block code(s)
RPO
UPC
Transmission
Axle
Opt Axle
Base
Esprit
Formula
Trans Am
Notes
34D
L22
Inline 6
Chevrolet
250
3.875 x 3.531
1 bbl
8.5:1
110@4200
235@1600
D
CBA, CBG
35A
M02
3 Speed Manual (Column Shift)
3.08:1
S
n/a
n/a
n/a
CBC, CBJ
35J
M35
2-Speed Powerglide Automatic
A
n/a
n/a
n/a
35K
M38
3-Speed Turbo Hydramatic Transmission (Turbo 350)
A
n/a
n/a
n/a
34H
L30
V-8
Pontiac
350
3.875 x 3.75
2 bbl
8.0:1
Single Exhaust 160@4400 (Esprit)
270@2000
M
WR
35B
M12
3 Speed Manual (Floor Shift)
3.42:1
A
S
S
n/a
35E
M20
4 Speed Wide Ratio Manual Transmission (Floor Shift)
A
A
A
n/a
Dual Exhaust 175@4400 (Formula)
YR
35J
M35
2-Speed Powerglide Automatic
2.73:1
3.08:1
A
A
A
n/a
35K
M38
3-Speed Turbo Hydramatic Transmission (Turbo 350)
A
A
A
n/a
34R
L65
V-8
Pontiac
400
4.125 x 3.75
2 bbl
8.2:1
175@4000
310@2400
R
YX, YZ
35L
M40
3-Speed Turbo Hydramatic Transmission (Turbo 400)
2.73:1
3.08:1
n/a
A
n/a
n/a
34S
L78
V-8
Pontiac
400
4.125 x 3.75
4 bbl
8.2:1
250@4400
325@3200
T
WK
35E
M20
4 Speed Wide Ratio Manual Transmission (Floor Shift)
3.42:1
n/a
n/a
A
n/a
YS, YT
35G
M22
Heavy Duty 4 Speed Manual Transmission
3.42:1
n/a
n/a
A
n/a
35L
M40
3-Speed Turbo Hydramatic Transmission (Turbo 400)
3.08:1
3.42:1
n/a
n/a
A
n/a
34X
LS5
V-8
Pontiac
455 HO
4.15 x 4.21
4 bbl
8.4:1
300@4000
415@3200
X
WD, WM
35G
M22
4 Speed Close Ratio Manual (Floor Shift)
3.42:1
n/a
n/a
A
S
YB, YE
35L
M40
3-Speed Turbo Hydramatic Transmission (Turbo 400)
3.42:1 w/o AC, 3.08:1 w AC
n/a
n/a
A
A
1972 Firebird Transmissions
RPO Code
UPC Code
Type
Usage
Codes
Base
Esprit
Formula
Trans Am
Notes
35A
M02
3 Speed Manual (Column Shift)
L22 250 cid Inline 6 Cylinder Column Shift
S
n/a
n/a
n/a
35B
M12
3 Speed Manual (Floor Shift)
L30 350 cid V8 Floor Shift
A
S
S
n/a
35E
M20
4 Speed Wide Ratio Manual Transmission (Floor Shift)
L30 350 cid V8
A
A
A
n/a
L78 400 cid V8 4bbl
n/a
A
A
n/a
35G
M22
4 Speed Close Ratio Manual (Floor Shift)
L78 400 cid V8 4bbl
n/a
n/a
A
n/a
LS5 455 cid HO V8
n/a
n/a
A
S
35J
M35
2-Speed Powerglide Automatic
L22 250 cid Inline 6 Cylinder
A
n/a
n/a
n/a
This option was dropped mid-year
L30 350 cid V8
A
A
n/a
n/a
35K
M38
3-Speed Turbo Hydramatic Transmission (Turbo 350)
L22 250 cid Inline 6 Cylinder
A
n/a
n/a
n/a
L30 350 cid V8
A
A
A
n/a
35L
M40
3-Speed Turbo Hydramatic Transmission (Turbo 400)
L65 400 cid V8 2bbl
n/a
A
n/a
n/a
L78 400 cid V8 4bbl
n/a
n/a
A
n/a
LS5 455 cid HO V8
n/a
n/a
A
A
In 1972 the GM published the net instead of the gross horsepower. Gross is the horsepower produced by the engine only while net is the horsepower with the engine and drivetrain drag added. Figures appear lower but most engines did not change.
* Engine codes WD and YE were used with the breaker point ignition. WM and YB with unitized breakerless ignition
1971 Engines
Where to find the Engine ID stamping
Chevrolet made Inline 6 Cylinder Engine (Typical)
Pontiac V-8 Engine (Typical)
Examples shown on this page consist of scanned images or reproduction artwork that can not be faithfully reproduced on a computer screen. Illustrations are for example only. Consult with your vendors offerring reproduction parts for their historical accuracy.
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