I bet the headers for the LS3/L99 will fit and clear the LSA for the Camaro. Only thing I can think of that it will have to clear would be the larger oil cooler at the back of the block. I had this same concern with my ZR1. I'm an American Racing Hearders dealer, and when I recieved my ZR1 they had me verify that their Z06 header would fit the ZR1, and it did. I'll do the same for my ZL1 when I get it. I already have a set of coated headers waiting.