SBE C5Z. On top of mods in sig, it'll now have CNC'd 243s and a ported fast 92 / ported ls2 tb. I'm trying to pick my lifters according to what RPM I need to spin to to make peak power with my setup. LS7 vs 5315 vs 2110? My tuner said I'll only need 6900 RPM, but the valve train guru doing my heads and intake mentioned 2110 and spin to the moon. So, what will be the RPM where I finish making power in my setup? 6800, 6900, 7000, 7200, 7500, ect?

Btr4 cam, btr springs and titanium retainers, btr pushrods, 1 3/4 headers, open x pipe, borla stingers, ls7 clutch, btr trunion upgrade

 

Go to 8500RPM. Then when your tuner and/or valve train guru say that's too much, tell them a guy on the internet said so.

Or just take the advice of the guys building your car

 

I have the same cam and 243's. when I was running a fast 92 and 1 3/4 headers my car peaked at 6300 and I have the limiter set at 7k

 

^^^^^ This X2

 

Well it seems like he is getting conflicting information. Op I would get the best the drop in morels and then look at your graph and figure out where you want to shift it

 

ls7s and shift between 6500-6750. I doubt you'll see gains spinning higher and that is considered a safe rpm for a SBE engine. This is where I shift with a similar combo.

 

well the cnc guy is said to spin to the moon with 2110s, but my tuner said I'll only need 6900. I'm currently at 6850 and make power all the way up to it, 439rwhp/401tq. I'm basically trying to justify $450 for 2110s.

 

And the cnc guy said 2110>5315>ls7 lifters

 

The Johnsons are better. Do them anyway.

All of them work to 7500 with a light enough valvetrain.

The FAST 92 isn't going to want to go that high... and neither is that cam. There's no reason to go past 7k with that combo.

 

Those are nice lifters, but they aren't necessary to turn 7k.

The LS7's would work, but the 5315 lifters have a couple features that make them better, but you may not really see an advantage on the dyno. Same with the 2110's. They have features that make them better, but depending on the rest of the combo, you may not realize those advantages on the dyno.

Cathedral port heads and long runner intakes, like the FAST, aren't really known for developing power after about 6200-6500 RPM. If you're going to see any power from a different hyd. lifter, its going to be mostly at higher RPM where it would be more stable than a lesser hyd. lifter. With the engine combo you described so far, it doesn't really sound like they'll be worth the money IMO.

My point earlier was that the guys building your car should have a good idea of how these lifters will work considering the total package. Obviously "to the moon" isn't a real answer, so I would lean on the expertise of the guys with the more technical answers.

 

thanks for the advice. The builders aunt giving me toooo much info because they are just porting and cnc'ing, I do all of the labor to my car. Ls7s sound like a proven choice for me with my mild setup and it sounds like it'll save me money to start beefing up drivetrain

 

No matter what you choose for top end, your limiting factor will be the stock bottom end. I wouldn't be spinning those past 7k anyway, so that's kind of where you should keep it at.