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I think you should address the cam before anything. I run an eforce on a very similar engine build to yours. The eforce is also rated at 20000 max rpm. Spinning it at 18000 and making about 12lbs of boost, I make considerably more power than you are making. That overlap is killing you I think.
You build sounds almost identical although I don't know what compression you are running., 402, underdrive pulley, ported cathedral heads, etc ,etc..
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2007 C6 vert, auto, F55, LT3
LME LS402 , WCCH 245 Heads, Pat G. Custom cam
YSI / 3.0 pulley, ARH 1 7/8 headers, NPP
Dewitts / dual spals, A&A dual pump fuel system.
3.42 polished gears, hardened shafts, Alky control meth, Cartech line lock, ECS axle loops, Trans brace, 6L80 built by me.
ID 1000 injectors, comp rockers, Morel lifters, BT springs, Trend 3/8 pushrods, ATI 10% OD Damper
Circle D Triple Disc stall
1009 RWHP @ 7000, 817 RWTQ @ 6000,
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