5.3 or ls 1 heads

[forcepower]

Are you running a 5.3 or ls1 5.7? If you are running the 5.3 engine I would stay with the 862's or aftermarket heads geared towards your build. The ls1 241 heads or ls1/ls2 243 heads will lower your compression. lowering the compression would be good for a forced induction application.