ACL 4B1780H-.25 Race Series Rod Bearing Set for 1985-1992 Toyota 4A-GE/4A-GZE

Vehicle Fitment

• 1985-1992 Toyota Corolla (4A-GE / 4A-GEC / 4A-GELC, 1.6 L DOHC)
• 1985-1992 Toyota MR2 (4A-GE / 4A-GZE, 1.6 L DOHC Supercharged)
• 1990-1992 Geo Prizm (4A-GE, 1.6 L DOHC)

Features

• Race Series high-performance rod bearing set
• Oversized +0.25 mm (0.010") to accommodate machined journals
• Tri-metal bearing alloy for enhanced fatigue resistance
• Identical-half bearing shells simplify installation
• Optimised oil groove and wall thickness for high RPM use
• Perfect for motorsport or turbocharged builds of 4A engine family
• Designed specifically for Toyota 1.6 L 4A-GE / 4A-GZE engines
• Ideal when crankshaft journal size has been machined to specification

Specifications

• Part Number: 4B1780H-.25
• Oversize: +0.25 mm (0.010") bearing size
• Material: Tri-metal overlay (F-series alloy)
• Shaft (Crank Journal) Max Size: ~42.00 mm
• Bearing Housing/Tunnel Size: ~45.00 mm (varies by application)
• Shell Length: ~17.1 mm
• Half-Type: Identical upper and lower shells

Included Components

• 1x Full rod bearing set (complete for one engine)

Product Description

The ACL 4B1780H-.25 Race Series rod bearing set is built for serious performance applications of Toyota's 1.6 L DOHC engines (4A-GE / 4A-GZE). Because it is sized at +0.25 mm oversize, it is ideal for engines that have had the crankshaft journals machined or ground to ~42.00 mm. The tri-metal construction and race-grade design ensure durability under high RPM and higher loads.

Featuring an identical-half design, installation is streamlined while achieving consistent clearances across installation. Oil groove geometry and material strength are optimised for engines subjected to boost or aggressive tuning. Whether you are building a high-output naturally-aspirated 4A-GE or a supercharged 4A-GZE, this bearing set provides a precision bottom-end component.

This bearing set applies to vehicles equipped with the Toyota 1.6 L 4A-GE / 4A-GZE engine - such as 1985-1992 Toyota Corolla and MR2, and 1990-1992 Geo Prizm - provided journal and housing sizes are appropriate. Always verify your crankshaft journal diameter and bearing housing size before fitting to ensure correct oil clearance and fitment.