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
											ZG	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
											YU	359	M38	3-Speed Turbo Hydramatic Transmission (Turbo 350)	2.73		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
											WW	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
353	std		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
352	M25	2-Speed Powerglide Automatic	L30 350 cid V8	EA	A	A	n/a	n/a	With L22 6 Cyl or 350 V8
359	M38	3-Speed Turbo Hydramatic Transmission (Turbo 350)	L22 250 cid Inline 6 Cylinder	JE	A	n/a	n/a	n/a
359	M38	3-Speed Turbo Hydramatic Transmission (Turbo 350)	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	PQ	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.