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.