BMW S14 Connecting Rod Bolts by ARP

Upgrade your BMW S14 engine, as found in the iconic E30 M3, with ARP Connecting Rod Bolts—the ultimate choice for strength, reliability, and performance. Crafted in the USA by Automotive Racing Products (ARP), these bolts are engineered to outperform OEM rod bolts and deliver superior durability in high-performance applications.

Perfect for rebuilds or preparing the engine for performance modifications, ARP rod bolts are built to handle extreme conditions with confidence. Manufactured from premium materials and precision-engineered, they resist stretch and protect your engine by keeping the connecting rods securely fastened to the crankshaft, even under high RPMs and intense loads.

Key Benefits:

• Exceptional Strength: Designed to handle higher stress levels, reducing the risk of failure in demanding setups.
• Unmatched Durability: Outstanding fatigue resistance ensures long-lasting performance.
• Perfect Fit: Custom-designed for the BMW S14 engine, ensuring seamless installation in your E30 M3.

Each kit includes 8 precision bolts and ARP’s trusted assembly lubricant for proper installation. Follow ARP’s torque specifications for optimal results.

Proven by professional builders and racers alike, ARP Connecting Rod Bolts are a must-have upgrade for anyone seeking maximum reliability and performance. Whether you're restoring your E30 M3, preparing it for the track, or enhancing its legendary driving dynamics, these bolts ensure your S14 engine is ready for anything.

Installation Instructions:

1. Ensure there is an adequate chamfer around the bolt hole on the connecting rod bolt hole on the connecting rod cap to clear the radius under the head of the bolt
2. Use ARP Ultra-Torque Fastener Assembly Lubricant to lubricate the threads of the bolt and the under head of the bolt. Then install the bolts and tighten them them hand tight. 
3. ARP recommends using the Stretch Method when tightening rod bolts. Following the instructions for using a stretch gauge, stretch the bolts to 0.0065 - 0.0070. 
4. If you do not have a stretch gauge, torque the bolts to 70 ft-lbs using ARP Ultra-Torque Fastener Assembly Lubricant.
5. The connecting rods should always be re-sized after new rod bolts are installed. 
6. A log should be kept on the original non-torqued length of each bolt. Bolts that have any permanent deformation or have increased in non-torqued length by more than 0.001 inch should be replaced. 

BMW S14 Applications:

BMW S14B20

1989-1991      E30     320is [Portugal and Italy]

BMW S14B23

1986-1991      E30     M3
1986-1987      E30     M3 Evo I
1988      E30     M3 Evo II

BMW S14B25

1990      E30     M3 Sport Evo (Evo III)