Generation IV Internal Engine - Factory LS3 cam with Cathedral port heads

Does anyone have any experience with running a factory LS3 cam (204/211 .551/.525 117) combined with gen III cathedral port heads?

That wouldn't be worth the effort to swap it.

If I recall correctly, that is basically a hybrid of an '01 and '02-up LS6 cam, so yes, it will work fine. You just need to make sure you are using a front cover and timing set with the appropriate cam sensor provisions since the Gen IV cam will not have a reluctor on the rear of the cam.

why not pick up a ls7/9 cam for 100 bucks?

That wouldn't be worth the effort to swap it.

Well I'm putting together the engine right now from a fresh shortblock, and I happen to have a stock cam out of an LS3 and a set of 5.3 cathedral port heads. The engine block itself is a gen IV aluminum 5.3.

If I recall correctly, that is basically a hybrid of an '01 and '02-up LS6 cam, so yes, it will work fine. You just need to make sure you are using a front cover and timing set with the appropriate cam sensor provisions since the Gen IV cam will not have a reluctor on the rear of the cam.

That's one issue that has already been found out, that I will need a different front cover than a gen III. I wasn't sure how well the cam would run with the older heads because of the higher difference in degrees between intake and exhaust.

why not pick up a ls7/9 cam for 100 bucks?

What are the specs and advantages of the LS7 and LS9 cams compared to the LS3?

If I was going to choose a factory cam to install in a 5.3 that would be the one

why not pick up a ls7/9 cam for 100 bucks?

Why not just do it the right away.....

Why not just do it the right away.....

what would that be?