SCE Vulcan Cut Ring Cylinder Head Gasket 101.30 mm Bore 1.20 mm Compression Thickness Subaru EJ Series HSMED11PA ApprovedEasy to adjust mechanical advance with supplied REM3026 ApprovedEasy to adjust mechanical advance with supplied springs and stop bushingsVacuum advance canister for improved economy (can be locked out)CNC machined billet aluminum housing and billet aluminum baseMaintenance free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm rangePolished steel shaft is QPQ coated and guided by a sealed ball bearingAdvance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reductionMechanical advance assembly can be locked out for crank trigger systemsAdvance weight pins are staked and tig welded to the plateNylon pads ensure smooth operation of the advance weightsSupplied with small diameter cap with HEI style terminals and race rotor (will accept 8441 Cap A Dapt)Must be used with an MSD Ignition Control Lightweight carbon fiber paired with breathable Product Description: street driven and competition liquid cooled engines