ARP 4G63 7-BOLT L19 HEAD STUD KIT - MITSUBISHI (LANCER EVO 8 9)
Part #: L19-7B
Fits: 2003-2006 Mitsubishi Evolution 8/9
1995-1999 Mitsubishi Eclipse / Eagle Talon 4G63
L19 differs from ARP2000 in that it is a vacuum melted alloyed steel with sufficient chromium and carbon to achieve high hardness (but below the level of a stainless steel). L19 is air-cooled from the hardening temperature in a way that does not require an oil quench to achieve full hardness and is tempered to assure full conversion to martensite between 1025°F and 1075 ̊F. L19 is a proprietary material capable of achieving strengths of 220,000/230,000 or 260,000/270,000 psi as may be required. Both L19 and ARP2000 steels are modified bcc (martensite) at room temperature. L19 has the same advantage as ARP2000 in that a high strength is obtained at a high tempering temperature. This alloy is easily contaminated and requires special handling.