I have no idea what LCA exactly is,but i know they help you get better 0-60 ft,i have bolt ons,M6, and MT drag radials,also 1.5 drop. Can anyone explain me what they are?where are they placed on the car,and where i can get it? ANY COMMENTS I WILL APRECCIATE my car its a 97 Z28

LCA=lower control arm, a suspension component located in the rear of the car. Here is a pic to give you an idea of where they are specifically and what they look like: http://www.spohn.net/product.cfm?productid=1292

Thank you 2000GTP,hopefully they will help me knock a couple of tenths on my 60 ft

since your car is lowered you may also want to look into LCA relo brackets...

here are pick of them http://www.spohn.net/category.cfm?categoryid=1042 if you can't weld or have access to somone who can then there are bolt on ones out there...

Wrong forum. The "engine tech" forums are only for engine related questions. I'll move this to the "Suspension....." forum for you.

So are relocation brackets a good idea for any ride height or just primarily for lowered cars?

The relocation bracket's, or any other good suspension part really, will help with giving the ability to make adjustments, and that allows you to tune your suspension. It's the adjustability that is the key. Now it is more of a need for a lowered cars since the LCA's change the angle when it is lowered, but if you have loose suspension and launch the car and it squats then technically the rear of the body lowers compaired to the axle that is stationary and possibly causing the LCA angle to go from a negative angle to a positive one...

Since you have a lowerd car you will probaly want the relocation brackets aswell, like a few of them have said.
+1 for spohn lca's