has any body used the slp Cylinder-Head-and-Cam Package, 1997-04 LS6 500 HP and what kind of power did it make

 

we have this set currently for sale

Stage 2 LS6 Heads(243 castings)
Fully Stage 2 Ported & Hand Polished to Competition Level
Polished Combustion Chambers
Bronze Guides Installed
New Hardened Valve Seats Installed
2.055 REV LS1 Intake Valves
1.60 REV LS1 Exhaust Valves
Patriot Dual LS1 Gold Series Valve Springs(good to .650 lift)
Titanium Retainers
Super 7 Locks
Hardened Spring Seats
Viton Valve Seals
Installed Heights and Spring Pressures Set
Bowls Blended
Competition Valve Job
Milled up to .030
Flowed with sheet
Only $2065.00 shipped to the continental U.S. ****NO CORE CHARGE!****
Intake Runner approx 232cc
Exhaust Runner approx 85cc
Combustion Chamber approx 64cc(heads will be at least lightly resurfaced)

Flow Numbers on our last set were

Lift Intake Exhaust
.100 71.3 57.3
.200 139.4 118.9
.300 203.1 167.3
.400 257.6 217.1
.500 293.0 234.2
.550 311.2 242.3
.600 321.3 248.3

Lead time is approx 2 weeks.
This is the only set we have!

we can do a full h/c package for $2574.99 shipped (to the Continental 48 States)
package would include:
The heads mentioned above
Custom Comp Cams Cam
Hardened Pushrods (available in 7.4, 7.35 or 7.45 length)
GM Head Bolts
GM Head Gaskets
Crank Pulley bolt
Water pump gaskets
Timing cover seal
timing cover gasket
400+rwhp would be easy with this setup.