Ls3
cliff notes version if you dont feel like reading: Gen 4(LS3) cam probably won't work in Gen 3(LS1) engine, plus a LS6 cam is more aggressive than a LS3 cam..............If your doing a cam swap go with a aftermarket cam because using a factory spec cam will only net a little more HP than what you already have.
heres a link to the thread: https://ls1tech.com/forums/generatio...shaft-ls1.html





