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4G63 Valve Spring & Retainer Kits
Designed for high rpm, BC valve springs by PAC Racing are wound from only the highest grade, super clean, chrome silicone alloy and feature proprietary processing procedures for consistent pressures. BC titanium retainers are CNC machined from 6AL4V round bar titanium to exacting tolerances.
Kit # Spring # Retainer # Seat # Description Buy Kit Status
BC0100 BC1100 BC2100 -- Single spring, titanium retainer In-Stock
BC0120 BC1120 BC2120 BC2910 Dual spring, titanium retainer, spring seat and valve seals In-Stock
Spring Pressure: BC1100 Seat: 1.550" @ 84 lbs / Open: 1.000" @ 235 lbs / Coil Bind: 0.935" (no machine work required)
Spring Pressure: BC1120 Seat: 1.550" @ 92 lbs / Open: 1.100" @ 235 lbs / Coil Bind: 0.970" (no machine work required)
4G63 Valve Keepers / Locks
6mm stem diameter, 6° billet performance valve stem keepers or locks are designed to fit BC and OEM retainers. Precision machined from premium billet bar stock chromoly steel and heat treated for maximum strength to insure against shoulder shearing (common with stock and lesser quality brands).
Part # Description # Buy Kit Status
BC2944 6° Billet Keepers / Locks for Mitsubishi 4G63/Evo applications In-Stock
4G63 Stainless Steel Valves
BC valves are one piece design with a friction welded Stellite tip for the best possible performance. Every valve is made from premium grade, heat resistant stainless steel material to insure reliability with high boost and/or high rpm applications. The undercut stem above the head area not only reduces overall weight for extended rpm potential, but also significantly improves air/fuel flow in and out of the combustion chamber. Every valve is fully machined and features a swirl polished finish under the head.
Part # Description Buy Now Status
BC3100 34.0mm Intake (standard head diameter) In-Stock
BC3101 30.5mm Exhaust (standard head diameter) In-Stock
BC3104 35.0mm Intake (+1mm head diameter) In-Stock
BC3105 31.5mm Exhaust (+1mm head diameter) In-Stock
4G63 VALVE GUIDES
BC premium valves guides are made from Manganese Silicon Aluminum Bronze alloy and CNC machined to exacting tolerances. BC guides are resistant to cracking and corrosion, while reducing friction and insures high lubrication even at elevated engine temperatures and rpm's. The perfect replacement to worn or damaged guides and 100% compatible with BC's lineup of stainless steel valves.
Part # Description Buy Now Status
BC3910 6.6mm INTAKE (Mitsubishi 4G63/Evo) In-Stock
BC3911 6.6mm EXHAUST (Mitsubishi 4G63/Evo) In-Stock
619.749.9018 ph
619.749.9128 fx
Some products listed are not legal for sale or use on emission controlled motor vehicles, RPM ranges vary on application.Warranty Information Copyright © Brian Crower Inc. All rights reserved.   Follow runBC on Twitter