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1975 Firebird Engines
RPO Code
UPC Code
Type
Source
Displ cid
Bore & Stroke
Carb
Comp
HP/RPM Net
Torque/RPM
VIN
Engine Block code(s)
Trans RPO
UPC
Transmission
Axle
Opt Axle
Base
Esprit
Formula
Trans Am
Notes
36D
L22
Inline 6
Chevrolet
250
3.875 x 3.531
1 bbl
8.25:1
105@3800
185@1200
D
JL, JT, JU
37B
M15
3 Speed Manual (Floor Shift)
2.73:1
S
n/a
n/a
n/a
37L
M38
3-Speed Turbo Hydramatic Transmission (Turbo 350)
A
S
n/a
n/a
36M
L30
V-8
Pontiac
350
3.875 x 3.75
2 bbl
7.6:1
155@4000
280@2000
M
YB
37L
M38
3-Speed Turbo Hydramatic Transmission (Turbo 350)
2.56:1
A
A
n/a
n/a
36E
L76
V-8
Pontiac
350
3.875 x 3.75
4 bbl
7.6:1
175@4000
280@2000
H
YN, YO
37E
M20
4 Speed Wide Ratio Manual Transmission
3.08:1
A
A
S
n/a
ZP
37L
M38
3-Speed Turbo Hydramatic Transmission (Turbo 350)
2.56:1
A
A
A
n/a
36S
L78
V-8
Pontiac
400
4.125 x 3.75
4 bbl
7.6:1
185@3600
310@1600
R or S
WT
37E
M20
4 Speed Wide Ratio Manual Transmission
3.08:1
n/a
n/a
A
S
37F
M21
4 Speed Close Ratio Manual Transmission
n/a
n/a
A
A
No cost option in Formula and Trans Am
YS
37L
M38
3-Speed Turbo Hydramatic Transmission (Turbo 350)
2.56:1
n/a
n/a
A
A
36W
L75
V-8
Pontiac
455 HO
4.15 x 4.21
4 bbl
7.6:1
200@3500
330@2000
W
WX
37E
M20
4 Speed Wide Ratio Manual Transmission
3.08:1
n/a
n/a
n/a
A
The 455 HO was introduced mid-year
37F
M21
4 Speed Close Ratio Manual Transmission
n/a
n/a
n/a
A
1975 Firebird Transmissions
RPO Code
UPC Code
Type
Usage
Codes
Base
Esprit
Formula
Trans Am
Notes
37B
M15
3 Speed Manual Transmission, Floor Mounted
L22 250 cid Inline 6 Cylinder
S
n/a
n/a
n/a
37E
M20
4 Speed Wide Ratio Manual Transmission (Floor Shift)
L76 350 cid V8
A
A
S
n/a
L78 400 cid V8 4bbl
n/a
n/a
A
S
L75 455 HO
n/a
n/a
n/a
A
37F
M21
4 Speed Close Ratio Manual Transmission (Floor Shift)
L78 400 cid V8 4bbl
n/a
n/a
A
A
No cost upgrade to Formula and Trans Am
L75 455 HO
n/a
n/a
n/a
A
37L
M38
3-Speed Turbo Hydramatic Transmission (Turbo 350)
L22 250 cid Inline 6 Cylinder
A
S
n/a
n/a
L30 350 cid V8
A
A
n/a
n/a
L76 350 cid V8
A
A
A
n/a
L78 400 cid V8 4bbl
n/a
n/a
A
A
1975 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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