Hey guys, couple quick questions regarding an LC9 motor I'm picking up this week. It has a failed DOD/AFM lifter, which I assume has wiped out the came lobe as well. I have a stock LS3 cam/Springs/Pushrods, Seats, etc from when I did a cam swap on my 2014 Camaro.

Just wondering if anyone has used the stock LS3 cam in a gen4 5.3, and what the results are? I anticipate they would be very similar to an LS6 cam?

Stock LS3 cam specs are:
204/211
.551/.525
117LSA

I am planning to Turbo this motor; I assume stock ls3 valve springs will be fine with moderate boost levels (15 ish psi)?

I am on the fence with gapping the rings; Any idea where they come in at stock?

Thanks

 

You definitely need to do valve springs, and the ls3 cam will be fine I ran one for a while and it did great.

 

If the LS3 (LS6) valve springs aren't good enough, would you suggest something like a PAC1218 .600 lift beehive, or just go straight to a .660 lift spring?

Thanks

 

Beehives would be my choice

 

Sounds good, Thanks for the help.

 

Not mine.

If I were gonna upgrade springs with a stock LS3 cam, I'd go with these --->> https://www.racingsprings.com/index..../category/408/

PAC-1202 duel valve springs.

KW

 

quick question for you guys, if the ls3 springs are ok in stock ls3 cars up to say 8lbs of boost, is there a reason they aren't ok on 243 heads with smaller and lighter valves with slightly more boost?

or is it a case where they are marginal in both applications?