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4B11 ACL RACE SERIES PERFORMANCE ENGINE BEARINGS
The unique combination of design, metallurgy and engineering come together to deliver what drivers expect from high performance Trimetal engine bearings. Designed to withstand higher RPM conditions, ACL Race Series Engine Bearings are available for many of the popular 4, 6 & 8 cylinder applications.
Part # Description # Sizes Buy Now Status
BC4130 BEARINGS - ACL Race Series HX - Rods, Mains (Mitsubishi 4B11T - Evo X) Standard In-Stock
4B11 ARP FASTENERS

Head Studs
ARP uses premium grade 8740 alloy that is heat treated to 200,000 p.s.i. This procedure ensures complete heat penetration and the results are far superior to those lesser quality studs from other manufacturers who just dump pieces in a basket and hope for the best. Following heat treat, each stud is centerless ground to make it as close to perfectly concentric as possible. This procedure involves about ten very slight cuts and results in an exceptionally straight part. ARP studs are thread rolled after heat treat which gives them about 1000% better fatigue strength than studs that are threaded prior to heat treat (a very common industry practice). It costs more to do it this way because itís tough on tooling but the results are well worth the extra effort.

Main Studs
ARP main studs eliminate main cap walk and fretting as well as protecting the threads in your engine block. All kits come complete with hardened parallel-ground washers and high quality nuts. Manufactured from 8740 chromoly steel, heat-treated in house to 200,000 p.s.i. tensile strength and precision J-form threads rolled after heat treat to create a fastener that has threads 1000% stronger than OEM produced studs. A must for high horsepower, high rpm engine applications.

Part # Description # ARP P/N Buy Now Status
AR8615 HEAD STUD KIT - ARP (Mitsubishi 4B11T / Evo X) 207-4206 In-Stock
AR8616 HEAD STUD KIT - ARP (Mitsubishi 4B11T / Evo X) Custom Age Upgrade 207-4207 In-Stock
AR8715 MAIN STUD KIT - ARP (Mitsubishi 4B11T / Evo X) 207-5403 In-Stock
4B11 DARTON SLEEVES
The Darton MID™ Sleeve Kit is available for many series of 4, 6, and 8 cylinder import and domestic engines and provides for maximum bore sizes and boost potential. The benefits of our MIDseries kits are:
  • Cast iron performance in an aluminum block
  • Improved block integral strength
  • Improved cooling
  • Kits can be installed by your local machine shop
  • "Wet sleeve" replace-ability
  • Full installation manual available on website
  • Increased horsepower output potential
  • High boost and horsepower potential
  • Superior oil and compression control
  • Superior cylinder sealing and ring wear
  • Street or strip application
  • Bulletproof Darton ductile iron,
  • 130,000-psi tensile strength
  • Part # Description # Darton P/N Bore Size Semi Bore O.D. Wall Thk Length Flange Thk Flange Dia Buy Now Status
    BC8011 BLOCK SLEEVES - Darton M.I.D. (Mitsubishi 4B11T - Evo X) 800-160 86mm-90mm 3.370" 3.850" 0.240" 5.475" 0.400" 4.625" In-Stock
    4B11 BC GASKETS
    BC gaskets are made in Japan and deliver the ultimate sealing capability even at extreme boost pressures. Individual die cut layers of stainless steel with superior consistency compared to other leading gaskets. These inferior brands are constructed with too high profile of beads which is prone to fatigue, losing the spring effect in a relatively short period of time and consistency of sealing pressure, resulting in leakage. BC gaskets are pre-coated stainless steel with a 0.2 micron consistent layer of Nitrile rubber that completely fills the cylinder head surface. Even a newly resurfaced cylinder head and/or block has a surface finish or roughness between 10 to15 microns and this Nitrile rubber completely seals the surfaces at operating engine temperatures, unlike the FKM type which is not suitable for filling the surface roughness because the material has too high of heat resistance. Basically the FKM does not melt to fill into the surface roughness providing the proper seal.

    Part # Description # Bore Buy Now Status
    BC8215 GASKETS - BC Made In Japan (Mitsubishi 4B11T / Evo X) 87mm In-Stock
    BC8216 GASKETS - BC Made In Japan (Mitsubishi 4B11T / Evo X) 90mm In-Stock