After my winter build project of a brand new LT1 Forged 1000HP build (C7 Z-51) with the below parts; all balanced down to 1 gram by our local top race engine machine shop (Moffit and Bratton). We are getting what we believe is false knock at higher RPMs on the dyno that is pulling all the timing (10-12 degrees). Car sounds and runs great, but we are having this constant knock issue. They chased the usual long tube header issues, looked for anything loose or touching, changed plug wires, inspected spark plugs, changed out fuel to Sunoco 260 + only to eliminate bad fuel or octane issues, and started to desensitize the knock tables for the LT1 (currently at 12.9). Please help!
My Build:
Magnuson Corvette LT1 TVS2650 Supercharger System with the 103MM throttle body (90mm upper w/DSX 15% lower 9.25)
Nick Williams 103 MM Throttle Body
RotoFab Big Gulp 5-inch C7 Z06 CAI
ARH Long Tube Headers 2 inch into a 3-inch X-pipe with high flow cats. Kept the NPP setup
Mighty Mouse catch can crank breather Wild -C7 10B.R Wild 10AN
NGK LTR7IX-11 Spark Plugs gapped at .28
Hinson 2500-degree Spark Plug wire boot protector for LT
BTR Gen V 180* Thermostat SD180LT1
GPI Drop-in Forged 10.25:1 Diamond Pistons with 6.125 Callies Compstar H-beam rods (CSC6125DS2A2AH)
Clevite - MAHLE Main Bearing Set GM/Chevy 2014+ Gen V 6.2L (L86/LT1/LT4) with Standard Size (Coated)
ACL ? H-Series Standard size rod bearings (Calico Coated) GPI-8B663H-STD
BTR Supercharged Stage 2 Cam Grind BTR227-354-242-348-15+6 +38%FL
BTR LT1 .660 Platinum Spring Kit with Titanium Retainers SK007/0560/BB
BTR trunnion upgrade kit for LS7 and Gen V LT1/LT4 A6200+24200-16
Chromoly One Piece Pushrods, 3/8' diameter, .080' wall, 7.850' length
LT1 DOD Delete Gen V DOD delete kit, Oil block off plugs, GM performance head gaskets, valley cover gasket, Johnson 2110R lifters set of 16P header gaskets, lifter trays
LME solid timing gear conversion with billet chain damper and billet timing cover. Removes VVT
Katech C5R HD Timing Chain
ARP HD Head stud kit 234-4343, ARP HD Main Stud kit 234-5802, ARP HD Flex Plate Bolts 234-2902 ARP HD Cam Sprocket Bolts 134-1003
OEM GM LT4 high pressure fuel pump (12694529) 12711668
OEM GM LT4 fuel injector (19420801 kit)
DSX Tuning low side fuel system for C7 Corvette 255 GPM Pump DSXC7AFPK
DSX Flex Fuel Sensor for C7 LT1 to run E-85 DMS-C7STINGFFK
OEM LT4 Engine Oil Pump - GM (12686435)
GM ? Chevrolet Performance GEN V LT4 Multilayer Head Gaskets 12654622
GM ? Chevrolet Performance GEN V LT Valve Cover Gasket 12619787
GM ? Chevrolet Performance GEN V LT1 Exhaust Manifold Gasket 12657093
GM ? Chevrolet Performance GEN V LT Water Pump Gasket 12657430
ATI Super Damper 917315 Dry Sump
DSX LT4 Lower Pully 235MM (9.25-15% OD)
GRIP TECH Upper 90MM
Harding Performance Billet Valve Covers with coil relocation. Dry Sump
TSP 10MM 30 OHM per foot Spark Plug Wires (Red) with heat boots
HD Tuners RTD (from Magnuson) with two Credits for ECU and TCM Forced induction GM calibration, 8L90E Transmission Calibration