1970 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 3.88 x 3.53 1 bbl 8.5:1 155@4200 235@1600 n/a ZB ZG standard Base
L30 V-8 Pontiac 350 3.88 x 3.75 2 bbl 8.8:1 255@4600 355@2800 n/a 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 n/a n/a XX optional Esprit
L78 V-8 Pontiac 400 4.12 x 3.75 4 bbl 10.25:1 330@4800 430@3000 n/a 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 n/a 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 n/a WW XP optional Trans AM

1970 Engines

Pontiac V8 engines were painted in a light blue meatllic 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.