1970 Firebird Engines

1970 Engine Firebird Specifications

                 
Engine ID Stamping
 
UPC Code Type Source Displacement (cubic Inches) Bore & Stroke

Carb

Comp
HP/RPM
Torque/RPM
Manual
Automatic
Usage
L-22 Inline 6 Chevrolet 250
3.88 x 3.53
1 bbl
8.5:1
155@4200
235@1600
ZB
ZG
standard Base
L30 V-8 Pontiac 350
3.88 x 3.75
2 bbl
8.8:1
255@4600
355@2800
WU
YU
standard Esprit, optional Base
L65 V-8 Pontiac 400
4.12 x 3.75
2 bbl
8.8:1
265@4600
397@2400
-
XX
optional Esprit
L78 V-8 Pontiac 400
4.12 x 3.75
4 bbl
10.25:1
330@4800
430@3000
WT
YS
standard Formula 400
L74 V-8 Pontiac 400 Ram Air III
4.12 x 3.75
4 bbl
10.5:1
335@5000
430@3400
WS
YZ
standard Trans Am, optional Formula
L67 V-8 Pontiac 400 Ram Air IV
4.12 x 3.75
4 bbl
10.75:1
345@5400
430@3700
WH
XN
optional Trans AM
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