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Engine Tuning

Tighten connecting rods correctly

How to install ARP connecting rod bolts
Bartek Bartoszewicz
Tuning Professional

The complete guide to mounting your connecting rods

Connecting rods are certainly the last components we want flying around freely as soon as we step on the gas. However, connecting rods are subject to enormous forces, which is why proper mounting is especially important. Here you will find complete instructions on how to mount the connecting rod bolts, as well as a table showing the correct stretch for each bolt.

It is best to have the following tools ready:

How to install ARP connecting rod bolts

Important installation instructions

  1. Disassemble and clean the rods (including bolt and beam threads) to remove rust preventative.
  2. Apply ARP Molylube to the threads and under the head of each bolt.
  3. Assamble the rod to the piston. The rod bearing notches must show to the intake of the engine, due to rotation direction of the crankshaft!
  4. Install rods by bringing cap and beam into alignment. Tap into place before installing bolts (DO NOT USE BOLTS TO PULL CAPS INTO POSITION) Each rod is numbered and MUST be assembled with the same number on cap and beam.

Rod torque specs

1 ft./lb. approximates 1,356 Nm

TypeSize InchSize metrichStretch InchStretch mm
ARP 2000 5/16" x 1.500" 7,9mm x 38,1mm 0.0056" 0.14224mm
ARP 8740 3/8" x 1.600" 9,5mm x 40,64mm 0.0047" 0.11938mm
ARP 2000 3/8" x 1.600" 9,5mm x 40,64mm 0.0058" 0.14732mm
ARP 8740
Wave Loc Bolt & Nut
3/8" 9,5mm 0.0063" 0.16002mm
ARP 8740 7/16" x 1.400" 11,1mm x 35,56mm 0.0046" 0.11684mm
SCAT 2001 7/16" x 1.500" 11,1mm x 38,1mm    
ARP 8740 7/16" x 1.600" 11,1mm x 40,64mm 0.005" 0.127mm
ARP 2000 7/16" x 1.600" 11,1m x 40,64mm 0.0062" 0.15748mm
ARP 8740 7/16" x 1.800" 11,1mm x 45,72mm 0.006" 0.1524mm
SCAT 2000 7/16" x 1.800" 11,1mm x 45,72mm    

All statements without guarantee. All rights reserved.

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Bartek Bartoszewicz
Tuning Professional
His first car was a Polo Mk1 with a 40 Weber twin carburetor and 129 PS (95 kW). His second was an Audi 50. Today Bartek tunes Lamborghinis to 1000 PS (735 kW). Even as a young boy, Bartek disassembled vehicles and put everything back together better. He wrote his high school diploma with oil on his fingers. The trained automotive mechanic with a focus on engines and gearboxes was determined to go into motorsports. In his 10 years in Formal 1, he supervised 73 races, including as engine mechanic for Ralf Schumacher at Toyota. Since 2010, he has dedicated himself fully to his company BAR-TEK® Motorsport and helps his customers to bring VW and Audi engines to peak performance.
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The right accessories for your connecting rod bolts

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Guaranteed to fit in your car!

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