Drag Racing Tech - SDPC heads ?

I see they're a sponsor here and was wondering.....

Looking at SD9063C and need to know spring pressures....These will be used with a LQ4 short block and a carburetor.
Cam is a CompCams custom ground using LSR lobes 239/247 at .050, 110/106. They recommend the Spring kit 26926TS-KIT.

IF they are, I could save a few $$$ buying the heads with spring upgrade Vs. piecing together used heads and a spring kit.(LS3 heads are on everybody's want list :( )

I thought the ls3 valves were too big to work in the 4.00" blocks. I'm thinking they are 2.200" valves... BUT I may be wrong. I have never looked @ any info on the ls3 stuff.

Rectangular port LS3 cylinder head assembly as used on Corvette's and 2010 Camaro's. Includes valve springs, 2.165" Hollow stem intake valves, 1.590" exhaust valves

requires 4.00" or bigger bore.

rodger that! it should make a pretty impressive setup... especially with a good 150 shot on top!