Reinforced ARP bolts for OEM rods TOYOTA LEXUS 2JZ-GE 2JZ-GTE

The engines concerned

This kit is intended for the Toyota 3.0-litre 24-valve 2JZ-GE and 2JZ-GTE engines, those of the Toyota Supra, Aristo, Soarer, Chaser, Cresta, Mark II, Crown, Altezza, Progres and Origin, and of the Lexus GS, IS and SC.

The original rod bolt of these engines carries the reference 13265-46020: the manufacturer prescribes tightening it oiled to 29 Nm, then a further 90 degrees.

Reinforced ARP bolts for connecting rods

At every revolution, the rod bolt takes the pull of the rod and piston assembly, which tries to force the cap away through inertia. As original equipment, it is sized for stock power and is replaced at every strip-down.

Once fitted in place of the original ones, these ARP2000 bolts are best tightened to a measured stretch, which ARP gives as its reference method; without a gauge, the instruction sheet indicates a torque. These bolts are made from ARP2000, an ARP-specific alloy steel heat treated to 220,000 psi tensile strength, with threads rolled once the treatment is complete. Classes 10.9 and 12.9 of standard fasteners start at 150,800 and 176,900 psi: ARP2000 exceeds them by 24 to 46%. The ARP2000 bolts hold up to 11,750 rpm (calculated estimate).

Technical specifications

Tightening torque and stretch

ARP gives priority to stretch control for an accurate preload; the torque in the table is used only when no gauge is available. Torque and stretch figures in the table apply with ARP lubricant.

The values above come from the ARP 203-6005 instruction sheet applicable at the date of publication; it is authoritative in the event of any difference. Read the ARP 203-6005 instruction sheet

Assembly is done without thread locker, as the ARP instruction sheet calls for none: ARP Ultra-Torque grease is applied to the threads and under the head of each bolt.

Once the fasteners are fitted, the ARP instructions call for the big ends to be checked and resized by a machine shop.

Measuring bolt stretch

Tightening to stretch means setting the preload on how much the bolt actually stretches, rather than on a torque affected by friction. With the bolt fitted, the dial gauge is placed on both its ends and the bolt is tightened until the stretch given in the table is read. It is the safest method on a highly tuned engine.

Technical guide

All the torque and stretch values on this page assume ARP assembly grease on the threads and under the bolt head; engine oil does not replace it.

The ARP brand

An engineer with an aerospace background, Gary Holzapfel launched ARP (Automotive Racing Products) in the early 1970s with one goal: to eliminate engine failures caused by weak fasteners in racing. ARP designs and manufactures thousands of part numbers in California, cylinder head, main and rod bolts, in several materials depending on the use, and has become known for the consistency of its manufacturing.

Vehicle compatibility

OEM reference (rod bolt): 13265-46020

Why is it the most cost-effective solution?

On a tuned 2JZ, every rod bolt sees a tensile load well above the standard one as soon as engine speed or power goes up: if one gives way, the rod, the piston and the block pay for it. Bolts in ARP2000 cost a fraction of putting a bottom end back in order.

Matching connecting rod bearings

To complete the bottom-end rebuild, we offer the connecting rod bearings intended for this engine.

Why not step up to forged connecting rods?

Hot forged under considerable pressure, generally from 4340 steel, a forged rod has a denser and more uniform structure than a stock rod. Against the original rod, frequently made of sintered metal and optimised for production cost, it brings about +19% yield strength, +8% tensile strength and +19 to +37% fatigue strength: enough to build a reliable high-power engine on. For your engine: