ACL 5M1219H-STD Race Main Bearing Set Standard Mitsubishi 4G63T 4G64 EVO DSM

Vehicle Fitment

• 1997-2006 Mitsubishi Eclipse GST / GSX (4G63T, 2.0L DOHC 16v Turbo, 2G DSM)
• 1997-2001 Eagle Talon TSi AWD / FWD (4G63T, 2.0L DOHC 16v Turbo)
• 2003-2005 Mitsubishi Lancer Evolution VIII (4G63T, 2.0L DOHC 16v Turbo)
• 2005-2006 Mitsubishi Lancer Evolution IX / IX MR (4G63T, 2.0L DOHC 16v Turbo)
• 1997-2003 Mitsubishi Galant (4G64, 2.4L SOHC 16v)
• Various Hyundai / Kia applications using the 4G64 2.4L engine

Fitment Notes

• This set is specifically for the 1997-on 4G63/4G63T/4G64 "7-bolt" block equipped with separate thrust washers (T/W). The pre-1997 4G63/4G64 uses a flanged main bearing design without separate thrust washers - those engines require 5M1186H instead. Using the wrong main bearing set will result in incorrect fit and clearance.
• Standard (STD) crankshaft main journal diameter - for use with stock or unworn journals at factory diameter only. For reground crankshafts, use 5M1219H-.025 (+0.025mm) or 5M1219H-.25 (+0.25mm) as appropriate.
• An HX extra-clearance variant (5M1219HX-STD) is also available for builders targeting approximately 0.025mm (0.001") additional running clearance at standard journal diameter without crankshaft grinding.
• Thrust washers (1T1219-STD) are sold separately - they are not included in this set.
• Always measure crankshaft main journal diameter with a micrometer before selecting bearing size. Confirm actual clearance with Plastigage or a dial bore gauge after assembly.
• Sold as a complete set of 10 bearing shells (5 pairs, upper and lower) - sufficient for all 5 main journal positions in one 4-cylinder engine.

Features

• Tri-metal construction: copper-lead alloy lining bonded over a hardened steel backing, with a high-strength overlay plate - engineered for the sustained high-boost loads and high-RPM demands of built 4G63T and 4G64 engines.
• Hardened steel backing on all main bearings improves structural support of the bearing lining and maintains crush under the elevated crank loads associated with high-power 4G63T builds.
• High-strength overlay plate with reduced thickness provides improved fatigue resistance compared to OEM-spec bearings - critical in high-boost DSM and Evo builds running elevated cylinder pressures over extended use.
• Increased bearing crush and tighter wall tolerances ensure consistent, secure seating in the block main journal bores, reducing the risk of bearing movement.
• Enlarged ID chamfers on bearing edges accommodate the larger fillet radii found on performance and aftermarket Mitsubishi crankshafts.
• 3/4-groove upper main bearings optimize oil supply to the main journals and to the connecting rod bearings through the cross-drilled crankshaft oiling passages.
• Elimination of flash plating on bearing backs improves heat transfer and maximizes grip between the bearing shell and the block main bore.
• Increased eccentricity compensates for bore distortion at high RPM and assists in the formation of a stable hydrodynamic oil film under load.

Specifications

• Part Number: 5M1219H-STD
• Product Line: ACL Race Series
• Application: Crankshaft Main Bearings
• Engine Compatibility: Mitsubishi 4G63 (2.0L DOHC), 4G63T (2.0L DOHC Turbo), 4G64 (2.4L SOHC) - 1997-on with thrust washers (7-bolt block)
• Crankshaft Size: Standard (STD - Unground)
• Shaft (Main Journal) Diameter: 56.985-57.000mm (2.2435-2.2441 in)
• Tunnel (Housing Bore): 61.000-61.021mm (2.4016-2.4024 in)
• Maximum Wall Thickness at Crown: 1.990mm (0.0784 in)
• Maximum Overall Length: 20.63mm (0.812 in)
• Bearing Material: Tri-Metal Copper-Lead Alloy / Hardened Steel Backing
• Thrust Washers: Not Included - order 1T1219-STD separately
• Quantity: Set of 10 Shells - 5 Upper + 5 Lower (complete engine set)

Included Components

• 10x Race Series Crankshaft Main Bearing Shells - Standard Size (5 upper, 5 lower)

Product Description

The ACL Race Series 5M1219H-STD crankshaft main bearing set is the standard-size performance replacement for the Mitsubishi 4G63, 4G63T, and 4G64 engines in their 1997-on "7-bolt" configuration - the block design used in the 2nd-gen DSM Eclipse GST/GSX, Eagle Talon TSi, and the Lancer Evolution VIII and IX. Designed for use with stock-diameter, unground crankshaft main journals, this is the standard selection for fresh engine builds using a serviceable factory crankshaft confirmed to be within standard dimensional tolerance.

The 1997+ block is distinguished from the earlier 4G63/4G64 by its use of separate thrust washers at the rear main journal - a critical fitment detail, as the pre-1997 flange-type main bearing (5M1186H) is not interchangeable with this set. Built on ACL's Race Series tri-metal platform, these main bearings deliver superior fatigue resistance, crush retention, and oil film stability over OEM Mitsubishi shells - an essential upgrade for any serious 4G63T build where sustained boost and high RPM place exceptional demands on the crankshaft bearing system. For builders targeting increased running clearance at standard journal size, the HX variant (5M1219HX-STD) is available separately. Thrust washers (1T1219-STD) must be ordered separately. Always confirm clearances at assembly. Sold as a complete set of 10 shells for one engine.