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1970
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Facts
1970 Firebird Engines
RPO Code
UPC Code
Type
Source
Displ cid
Bore & Stroke
Carb
Comp
HP/RPM
Torque/RPM
VIN
Block code(s)
RPO
UPC
Transmission
Axle
Opt Axle
Base
Esprit
Formula
Trans Am
Notes
341
L22
Inline 6
Chevrolet
250
3.88 x 3.53
1 bbl
8.5:1
155@4200
235@1600
n/a
ZB
353
std
3 Speed Manual (Column Shift)
3.08
S
n/a
n/a
n/a
ZG
352
M25
2-Speed Powerglide Automatic
A
n/a
n/a
n/a
359
M38
3-Speed Turbo Hydramatic Transmission (Turbo 350)
A
n/a
n/a
n/a
343
L30
V-8
Pontiac
350
3.88 x 3.75
2 bbl
8.8:1
255@4600
355@2800
n/a
WU
353
std
3 Speed Manual (Floor Shift)
3.36
A
S
n/a
n/a
355
M13
3 Speed Heavy Duty Manual with Floor Shift
A
A
n/a
n/a
354
M20
4 Speed Wide Ratio Manual Transmission (Floor Shift)
A
A
n/a
n/a
YU
352
M25
2 Speed Powerglide Automatic
2.73
A
A
n/a
n/a
359
M38
3-Speed Turbo Hydramatic Transmission (Turbo 350)
A
A
n/a
n/a
346
L65
V-8
Pontiac
400
4.12 x 3.75
2 bbl
8.8:1
265@4600
397@2400
n/a
XX
351
M40
Turbo Hydramatic 3 speed Automatic (Turbo 400)
3.07
3.31**
n/a
A
n/a
n/a
345
L78
V-8
Pontiac
400
4.12 x 3.75
4 bbl
10.25:1
330@4800
430@3000
n/a
WT
355
M13
3 Speed Heavy Duty Manual with Floor Shift
3.55 w/o AC. 3.31 w AC
3.73*
n/a
n/a
S
n/a
354
M20
4 Speed Wide Ratio Manual Transmission (Floor Shift)
n/a
n/a
A
n/a
358
M21
4 Speed Close Ratio Manual Floor Shift with Hurst Shift
n/a
n/a
A
n/a
requires (361) Safe-T-Track
YS
351
M40
3-Speed Turbo Hydramatic Transmission (Turbo 400)
3.07
n/a
n/a
A
n/a
348
L74
V-8
Pontiac
400 Ram Air III
4.12 x 3.75
4 bbl
10.5:1
335@5000
430@3400
n/a
WS
355
M13
3 Speed Heavy Duty Manual with Floor Shift
3.55 w/o AC. 3.31 w AC
3.73*
n/a
n/a
A
n/a
354
M20
4 Speed Wide Ratio Manual Transmission (Floor Shift)
n/a
n/a
A
S
358
M21
4 Speed Close Ratio Manual Floor Shift with Hurst Shift
n/a
n/a
A
A
requires (361) Safe-T-Track in Formula 400 (std with Trans Am)
YZ
351
M40
3-Speed Turbo Hydramatic Transmission (Turbo 400)
3.55
n/a
n/a
A
A
347
LS1
V-8
Pontiac
400 Ram Air IV
4.12 x 3.75
4 bbl
10.75:1
345@5400
430@3700
n/a
WW
354
M20
4 Speed Wide Ratio Manual Transmission (Floor Shift)
3.73
n/a
n/a
n/a
A
358
M21
4 Speed Close Ratio Manual Floor Shift with Hurst Shift
n/a
n/a
n/a
A
XP
351
M40
3-Speed Turbo Hydramatic Transmission (Turbo 400)
n/a
n/a
n/a
A
1970 Firebird Transmissions
RPO Code
UPC Code
Type
Engine Option
Code
Base
Esprit
Formula
Trans Am
Notes
353
std
3 Speed Manual (Column shift with L22 6 Cyl, Floor shift with 350 V8)
L22 250 cid Inline 6 Cylinder Column Shift
R3
S
n/a
n/a
n/a
L30 350 cid V8 Floor Shift
R4
A
S
n/a
n/a
355
M13
3 Speed Heavy Duty Manual with Floor Shift
L30 350 cid V8
DG
A
A
n/a
n/a
L78 400 cid V8
n/a
n/a
S
n/a
L74 Ram Air III 400 V8 (Formula)
n/a
n/a
A
n/a
354
M20
4 Speed Wide Ratio Manual Transmission (Floor Shift)
L30 350 cid V8
WB
A
A
n/a
n/a
Not available with (754) Mountain Performance Axle
L78 400 cid V8
n/a
n/a
A
n/a
L74 Ram Air III 400 cid V8
n/a
n/a
A
S
L67 Ram Air IV 400 cid V8
n/a
n/a
n/a
A
358
M21
4 Speed Close Ratio Manual (Floor Shift)
L78 400 cid V8
WL
n/a
n/a
A
n/a
Requires (361) Safe-T-Track Differential
L74 Ram Air III 400 cid V8
n/a
n/a
A
A
LS1 Ram Air IV 400 cid V8
n/a
n/a
n/a
A
352
M25
2-Speed Powerglide Automatic
L22 250 cid Inline 6 Cylinder
EB
A
n/a
n/a
n/a
With L22 6 Cyl or 350 V8
L30 350 cid V8
EA
A
A
n/a
n/a
359
M38
3-Speed Turbo Hydramatic Transmission (Turbo 350)
L22 250 cid Inline 6 Cylinder
JE
A
n/a
n/a
n/a
L30 350 cid V8
JF
A
A
n/a
n/a
351
M40
3-Speed Turbo Hydramatic Transmission (Turbo 400)
L65 400 cid V8
PF
n/a
A
n/a
n/a
Requires Console (D55). No charge on Trans Am
L78 400 cid V8
PX
n/a
n/a
A
n/a
L74 Ram Air III 400 cid V8
PQ
n/a
n/a
A
A
LS1 Ram Air IV 400 cid V8
n/a
n/a
A
A
1970 Engines
Pontiac V8 engines were painted in a light blue metallic color. 6 Cylinders were Chevrolet Orange.
Where to find the Engine ID stamping
Chevrolet made Inline 6 Cylinder Engine (Typical)
Pontiac V-8 Engine (Typical)
250 cid 1 bbl 6 Cylinder, Chevrolet
400 Standard Formula
When the RAM AIR III was added to the Formula Model the hood scoops became functional. Hood scoops were blocked off on all other engine options. The Ram Air can be easily identified by the rubber boots attached to the upper hood.
The Ram Air III was the standard Trans Am Engine.
The Ram Air IV 400 cubic inch V8 was a little known option on the Trans Am option list. It was not listed on the general, public order form to keep its use to drag racing. Knowledgable enthusiast knew better though. A Ram Air IV can be identified by it's dual snorkels emanating from the air cleaner. Thae Ram Air III had one. There were no call out decals on 1970 Trans Am hood scoops and the scopp itself was functional.
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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