87mm MLS Head Gasket .051 - Mits 4G63/4G63TB

The 87mm MLS Head Gasket .051 for Mitsubishi 4G63/4G63TB is a precision-engineered component engineered for builders and mechanics targeting reliable, high-boost performance in turbocharged and naturally aspirated four-cylinder platforms. This gasket is essential for anyone upgrading boost levels, modifying ignition timing, or rebuilding a 4G63 engine that has experienced head lift or detonation-related failures. Whether you're prepping a street engine or a competition build, proper head gasket selection directly impacts sealing integrity under sustained pressure and thermal cycling.

Multi-Layer Steel (MLS) construction provides superior conformability and reusability compared to traditional composite gaskets, allowing it to seal reliably across port faces and between cylinder bores even with minor surface irregularities. The .051-inch thickness is specifically calibrated for 4G63 head and block deck geometry, maintaining precise combustion chamber volume and compression ratio—critical for tuning accuracy and knock control. The 87mm bore diameter corresponds to the 4G63's cylinder bore size, ensuring complete port coverage and preventing exhaust or coolant leakage around individual cylinders. MLS gaskets excel under high-boost conditions (15+ psi) and sustained RPM operation where thermal growth and pressure cycling would compromise softer gasket materials.

This gasket is ideal for Mitsubishi Lancer Evolution, DSM (Diamond-Star Motors), and 4G63-swapped platforms running modified fuel systems, turbo upgrades, or internal engine work. Proper installation requires careful surface preparation—a clean, flat head and block deck are mandatory for MLS gasket performance. The gasket must be torqued to OEM specifications in a star or cross pattern for even clamping pressure; under-torquing risks leakage, while over-torquing can crush the MLS layers. Compatible with both 4G63 carbureted and 4G63TB turbocharged variants, this gasket is a critical upgrade for any serious 4G63 rebuild seeking dependable sealing and extended engine durability.