LS1 vs LS6: What's the Difference?

The GM LS1 5.7L and the GM LS6 5.7L differ in compression ratio, factory rating, model years. The table puts the factory specs side by side; each engine's own page has the full specs.

Specs side by side

	GM LS1 5.7L	GM LS6 5.7L
Engine	GM LS1 5.7L	GM LS6 5.7L
Displacement	346.1 ci (5.67 L)	346.1 ci (5.67 L)
Bore × stroke	3.900" × 3.622"	3.900" × 3.622"
Cylinders	8	8
Compression ratio	10.1:1	10.5:1
Factory rating	305 hp–350 hp	385 hp–405 hp
Block	aluminum	aluminum
Heads	aluminum	aluminum
Rod length	6.098"	6.098"
Deck height	9.240"	9.240"
Weight (approx.)	425 lb–460 lb	425 lb–460 lb
Fuel	gas	gas
Model years	1997–2004	2001–2005

Where versions of an engine differ, the table shows the range across them. Ratings are the makers' published figures.

Which cars got each engine

GM LS1 5.7L	Years
Chevrolet Corvette	1997–2004
Chevrolet Camaro	1998–2002
Pontiac Firebird	1998–2002
Pontiac GTO	2004

GM LS6 5.7L	Years
Chevrolet Corvette	2001–2004
Cadillac CTS	2004–2005

More

• GM LS1 5.7L specs
• GM LS6 5.7L specs
• All engine comparisons