Ls?
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
I'm assuming you're referring to the engine RPO codes LS1 and LS6 in the C5 Corvettes ....
LS doesn't "stand" for anything.
In the early 1960's GM started using a 3 position code for "Regular Production Option" (RPO) identification.
Generally, codes starting with an L in the Chevy line are engines ... and since the code can be a combination of letters and numbers, previous Corvettes have had engine RPOs such as L88, LS1, and LT5.
Generally, RPO's starting with a Z are "performance" options (or option packages). Hence in the 1960s a package was offered on the Corvette called Z06, and in the Camaro line there was the well known Z28 package.
A last example is codes starting with U as these are generally radio/entertainment system options.
LS doesn't "stand" for anything.
In the early 1960's GM started using a 3 position code for "Regular Production Option" (RPO) identification.
Generally, codes starting with an L in the Chevy line are engines ... and since the code can be a combination of letters and numbers, previous Corvettes have had engine RPOs such as L88, LS1, and LT5.
Generally, RPO's starting with a Z are "performance" options (or option packages). Hence in the 1960s a package was offered on the Corvette called Z06, and in the Camaro line there was the well known Z28 package.
A last example is codes starting with U as these are generally radio/entertainment system options.
So far it only comes in stages 1, 2, 6, and 7. 
