Spotter's Guide Hood Bird Guide Color Guide

1972 Firebird Engines

                    Engine ID Stamping  
UPC Code Type Source Displacement (cubic Inches) Bore & Stroke Carb Comp HP/RPM Torque/RPM VIN Manual Automatic Usage
L-22 Inline 6 Chevrolet 250 3.875 x 3.531 1 bbl 8.5:1 110@4200 235@1600 n/a CBA, CBG, CBJ, CBC standard Base
L30 V-8 Pontiac 350 single exhaust 3.875 x 3.75 2 bbl 8.0:1 160@4400 270@2000 n/a WR, YV, YR standard Esprit, optional Base
L30 V-8 Pontiac 350 dual exhaust 3.875 x 3.75 2 bbl 8.0:1 175@4400 275@2000 n/a YV standard Formula 350
L65 V-8 Pontiac 400 4.125 x 3.75 2 bbl 8.2:1 175@4000 310@2400 n/a - YX, ZX optional Esprit
L78 V-8 Pontiac 400 4.125 x 3.75 4 bbl 8.2:1 250@4400 325@3200 n/a WK, YS, WS standard Formula 400
LS5 V-8 Pontiac 455 HO 4.15 x 4.21 4 bbl 8.4:1 300@4000 415@3200 n/a WD, YE, WM, YB* standard Formula 455 and Trans Am
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 useed with the breaker point ignition. WM and YB with unitized breakerless ignition