Pontiac GTO Engines by Year

The GTO started in 1964 as an option package on the Tempest LeMans, became its own series in 1966 and was built until 1974. Pontiac revived the name for 2004–2006 on a Holden-built coupe with GM's LS V8s.

Pick a year to see every engine offered that model year, with its code, rated horsepower and the trims it came in. Each engine links to its full specs.

Jump to a year

1964–1967: 1964 · 1965 · 1966 · 1967

1968–1972: 1968 · 1969 · 1970 · 1971 · 1972

1973–1974: 1973 · 1974

2004–2006: 2004 · 2005 · 2006

1964–1967

The first GTOs used the 389 with a four-barrel or three two-barrel Tri-Power carburetors. The 1967 GTO replaced the 389 with the 400 and dropped Tri-Power for a single four-barrel.

1964 GTO engines

Engine	Rated	Offered in
389 V8 GTO option, 389 4-bbl	325 hp gross	LeMans GTO
389 V8 GTO Tri-Power 3x2-bbl	348 hp gross	LeMans GTO

1965 GTO engines

Engine	Rated	Offered in
389 V8 GTO option, 389 4-bbl	335 hp gross	LeMans GTO
389 V8 GTO Tri-Power 3x2-bbl	360 hp gross	LeMans GTO

1966 GTO engines

Engine	Rated	Offered in
389 V8 GTO 389 4-bbl	335 hp gross	GTO
389 V8 GTO Tri-Power 3x2-bbl	360 hp gross	GTO

1967 GTO engines

Engine	Rated	Offered in
400 V8 GTO optional 2-bbl	255 hp gross	GTO
400 V8 GTO 400 4-bbl	335 hp gross	GTO
400 V8 GTO HO and Ram Air	360 hp gross	GTO

1968–1972

The 1968 GTO brought Ram Air 400s, which reached the Ram Air IV in 1969, and a 455 from 1970. Ratings are gross through 1971 and SAE net from 1972.

1968 GTO engines

Engine	Rated	Offered in
400 V8	265 hp gross	GTO
400 V8	350 hp gross	GTO
400 V8	360 hp gross	GTO
400 V8	360 hp gross	GTO
400 V8 Ram Air II, added partway through 1968. Also published as 360 hp.	366 hp gross	GTO

1969 GTO engines

Engine	Rated	Offered in
400 V8 (XX) Two-barrel economy 400.	265 hp gross	GTO
400 V8	350 hp gross	GTO
400 V8	366 hp gross	GTO, The Judge (standard)
400 V8	370 hp gross	GTO, The Judge

1970 GTO engines

Engine	Rated	Offered in
400 V8	350 hp gross	GTO
400 V8	366 hp gross	GTO, The Judge (standard)
400 V8	370 hp gross	GTO, The Judge
455 V8	360 hp gross	GTO

1971 GTO engines

Engine	Rated	Offered in
400 V8	300 hp gross	GTO
455 V8	325 hp gross	GTO
455 V8 (LS5)	335 hp gross	GTO, The Judge (standard)

1972 GTO engines

Engine	Rated	Offered in
400 V8	250 hp net	GTO option (LeMans)
455 V8	250 hp net	GTO option (LeMans)
455 V8 (LS5)	300 hp net	GTO option (LeMans)

1973–1974

The 1973 GTO was an option on the Colonnade LeMans with a 400 or 455. For 1974 it moved to the compact Ventura with a 350.

1973 GTO engines

Engine	Rated	Offered in
400 V8	230 hp net	GTO option (LeMans Colonnade coupe/Sport Coupe)
455 V8	250 hp net	GTO option (LeMans Colonnade coupe/Sport Coupe)

1974 GTO engines

Engine	Rated	Offered in
350 V8	200 hp net	GTO option (Ventura / Ventura Custom coupe & hatchback)

2004–2006

The revived GTO used the 5.7L LS1 in 2004 and the 6.0L LS2 in 2005–2006.

2004 GTO engines

Engine	Rated	Offered in
5.7L / 346 V8 (LS1)	350 hp net	GTO

2005 GTO engines

Engine	Rated	Offered in
6.0L / 364 V8 (LS2)	400 hp net	GTO

2006 GTO engines

Engine	Rated	Offered in
6.0L / 364 V8 (LS2)	400 hp net	GTO

Working on one of these engines?

← All Pontiac vehicles