ARP Main Bearing Cap Bolt Kit | 4A-GE / 4A-GZE (AE86 Corolla / AW11 MR2 / AE92 Corolla)

ARP Main Bearing Cap Bolt Kit

For 1983–1987 Toyota Corolla AE86, 1984–1989 Toyota MR2 AW11, and 1987–1991 Toyota Corolla AE92 coupe equipped with 4A-GE / 4A-GZE 16V engines.

Overview

This ARP main bearing cap bolt kit is an alternative to a stud conversion for a planned 4A-GE or 4A-GZE engine build. It supplies the bolts that secure the crankshaft's main bearing caps, with washers and ARP Ultra-Torque assembly lubricant.

Applications include 1983–1987 AE86 Corolla in Japan and 1985–1987 AE86 Corolla GT-S in the U.S.; 1984–1989 AW11 MR2 in Japan and 1985–1989 AW11 MR2 in the U.S.; and 1987–1991 Corolla AE92 coupes in Japan and 1988–1991 AE92 Corolla GT-S coupes in the U.S. Engine and supercharged-model year restrictions apply.

It is intended for engine-building work with factory-style main caps, not routine bolt-on maintenance. Changing main fasteners can affect main-bearing bore dimensions, so additional machine work may be necessary.

Key Features

• Ten main-cap bolts for one engine.
• M10 x 1.25 threads for the supported Toyota 4A-GE / 4A-GZE applications.
• Washers and ARP Ultra-Torque assembly lubricant included.
• A lower-cost alternative to main studs when the build does not require the stud configuration.

Vehicle Fitment

Toyota Corolla — AE86

• 1983–1987: Trueno (JDM) / 4A-GE 16V.
• 1983–1987: Levin (JDM) / 4A-GE 16V.
• 1985–1987: GT-S (U.S.-Market) / 4A-GE 16V.

Toyota MR2 — AW11 / MK1

• 1984–1989: JDM / naturally aspirated 4A-GE 16V.
• 1985–1989: U.S.-Market / naturally aspirated 4A-GE 16V.
• 1986–1989: JDM Supercharged / 4A-GZE.
• 1988–1989: U.S.-Market Supercharged / 4A-GZE.

Toyota Corolla / Sprinter — AE92 — Coupe

• 1987–1991: Trueno / Levin GT or GT APEX (JDM) / 4A-GE 16V.
• 1987–1989: Trueno / Levin GTV (JDM) / 4A-GE 16V.
• 1987–1991: Trueno / Levin GT-Z (JDM) / 4A-GZE.
• 1988–1991: GT-S coupe (U.S.-Market) / 4A-GE 16V.

Fitment Notes

• For the specified 4A-GE and 4A-GZE engines with factory-style main bearing caps. The listed chassis years do not cover every engine offered in those vehicles.
• Factory AE86 SR5 models with 4A-C engines are outside this application.
• The kit also supports 4A-GE 20V engines. Engine-swapped cars must be matched by their actual engine and main-cap arrangement, not chassis year alone.
• Aftermarket main caps, reinforcement caps and girdles require their own hardware selection; compatibility is not automatic.
• Main-bearing bore inspection and possible align-honing are part of the engine-build considerations when changing main fasteners. This kit is not a guarantee of a machining-free rebuild.

Product Specifications

Brand: ARP
Product Type: Main bearing cap bolt kit
Engine Application: 4A-GE 16V / 20V and 4A-GZE
Thread: M10 x 1.25
Fastener Quantity: 10 bolts

Should You Choose Main Bolts or Main Studs?

ARP Main Bolts — Best for Keeping a Planned Performance Rebuild More Affordable

Choose the bolt kit if your engine build calls for upgraded main fasteners but does not require studs or reinforcement-cap hardware. It costs less than the stud kit while retaining a bolt-style arrangement.

ARP Main Stud Kit — Best for High-Load 4A-GE / 4A-GZE Builds

Choose the stud kit for a 4A-GE / 4A-GZE build facing extreme engine loads, where more consistent clamping is the priority. Check the linked kit's application and any reinforcement-cap requirements rather than treating bolts and studs as interchangeable.

Our Recommendation: Do not replace sound factory main bolts solely for normal naturally aspirated street use. For a planned performance build, choose bolts when cost matters and studs are not required; choose studs when the engine's load or reinforcement hardware calls for them.

What's Included

• (10) main bearing cap bolts.
• Washers.
• ARP Ultra-Torque assembly lubricant.