LS7 is a good lifter for it's intended use, but it's not designed for high rpm with higher spring rates and heavier valves. Remember the LS7 engine used a mild lobe cam with titanium valves and 1.8 rockers. If you plan on spinning the engine north of 6800rpm with a dual spring and non light weight valve, I would spring for the Johnson 2110. They won't be as susceptible to pump up at higher rpm like the LS7.

Fwiw, I am running a Morel drop in, light weight sodium valves, ti retainers, SLP rockers, and a PAC dual. I spin it north of 7k at least once Everytime I get it out for 3yrs now with no issues. I have yet to feel it go flat or lay over all the way to 7200.

That being said, Had I known about the Johnson 2110 at the time I would of went with those. Copo Camaros turning 8500rpm with that lifter.

 

So I want a 11:1:1 compression what size cc should I get to achieve that? they are tsp 2.5 stage heads on a stock ls1

 

I am running SBE with a 61.5 cc LS6 head done by TEA. Compression is around 11:3 with a .045 gasket.

 

61cc here with .040 @ 11.5:1 Stock bottom.

 

What kind of gas are you running?

 

I'm running 11.5:1 on 93 pump. Stay below that and you'll be fine

 

It's hard to find 93 here mainly there is just 91 what size cc would I need to run 11:1:1 compression. I've heard that anything over 11:25:1 isn't good on it if your engine means anything to you

 

Would I be fine running 11:5:1 on 91 gas since I can't really find 93 here or should I run a 11:1:1 on 91 gas.
i have heard not to run over 11:25:1 if you care for your motor

 

If it were me I'd stay below 11.1 on 91 octane. That's just me though

 

So would 11:1:1 be ok or should I run lower then 11:1:1 I'm just trying to figure out what cc I should run I think a 62 would give me that