Ok seriously here is Lingenfelter:
Package includes:
? Engine removal, inspection and disassembly
? Block machining and machining for sleeves
? Custom aluminum block preparation
? Darton modular sleeve assemblies
? ARP 8740 premium grade head studs
? Lingenfelter CNC ported & polished LS6 cylinder heads
? Stainless steel 2.100" hollow stem intake valves
? Stainless steel 1.57" hollow stem sodium filled exhaust valves
? Comp Cams double valve springs and titanium retainers
? 3 angle valve job, checking of spring tensions and heights
? Custom designed Lingenfelter hydraulic roller camshaft
? 1.85:1 roller rocker arms and HD pushrods
? Cloyes heavy duty timing chain set
? Lingenfelter HD rocker arm stands
? Custom forged aluminum pistons - 11.0:1 compression
? Custom forged steel crankshaft - 4.00" stroke
? Billet steel connecting rods - 6.125" long
? Computer balanced rotating assembly
? Reassembly and blueprinting of the engine
? Engine dyno test including 1 hour break-in procedure*
? Stainless steel exhaust by Corsa Performance
? Lingenfelter low restriction air inlet system
? Lingenfelter engine oil cooler package
? Fast composite intake manifold, 90 MM throttle body & fuel injectors
? ASP underdrive pulley & Goodyear belt
? Professional installation, testing and tuning
? Chassis dyno testing after installation
? LPE?s 2 year / 24,000 mile warranty
427 CID engine package $24,995.00
HD automatic transmission rebuild $2,595.00
Yank 2,800 stall torque converter $600.00
Heavy duty clutch upgrade TBA
Granted they padded it a little but they upgraded internals.
IF this package makes 510..
CNC ported cylinder heads.
Custom cam and push rods.
1 3/4 ceramic coated long tube headers.
2.5 inch high flow exhaust
Custom computer tuning
Custom 4 inch air intake system.
do you really think this one does too? Cam, headers, exhaust, intake, and computer for 510bhp? 400 tops imo.