Close-up of ARP Pro Series rod bolt with rolled threads and wave-loc design
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ARP Ford Cosworth Sierra/Escort Pro Rod Bolt Kit

ARP
ARP251-6301
672036019198
Rod Bolt Kits
4 Units In Stock - Ships Next Business Day
$ 76.16
$ 76.16

SKU: 251-6301 | UPC: 672036019198

ARP Ford Cosworth Sierra/Escort Pro Series Rod Bolt Kit 1986-1996

The ARP 251-6301 Pro Series Rod Bolt Kit upgrades connecting rods in Ford Cosworth YB 2.0L turbo engines found in Sierra RS Cosworth and Escort RS Cosworth models. This kit uses 8740 chromoly steel bolts with precise rolled threads for accurate stretch and torque values under high boost or race conditions. It prevents rod bolt stretch or failure to maintain engine reliability at extreme RPM.

Key Features

  • 8740 Chromoly Steel: Heat-treated construction resists fatigue and handles loads over 200,000 psi tensile strength
  • Pro Series Wave-Loc Design: Reduces stress risers at thread root for longer fatigue life in turbo engines
  • Precision Rolled Threads: Centerless ground shank ensures consistent clamp load and stretch measurement
  • Complete Kit Contents: 8 bolts, hardened washers, and ARP moly assembly lube for proper installation
  • Thread Specs: 10mm x 1.25 pitch, 1.890 inch under head length, direct OEM replacement fit

Product Notes

  • Kit designed for Cosworth YB engines in high-boost, nitrous, or race setups
  • Made in the United States with limited lifetime warranty
  • Ships in official ARP retail box, weight 0.35 lbs

Installation Notes

  • Professional installation recommended.
  • Torque to ARP specifications using stretch gauge for accurate preload
  • Fits stock or aftermarket Cosworth YB connecting rods without modification

This Part Fits

Year Make Model Submodel
1986-1992 Ford Sierra RS Cosworth 2.0L YB Turbo
1992-1996 Ford Escort RS Cosworth 2.0L YB Turbo

Why Choose ARP?

  • Race-proven fasteners trusted in professional motorsports worldwide
  • 8740 chromoly steel exceeds OEM bolt strength for turbocharged durability
  • Engineered precision from rolled threads to wave-loc wire retention

Frequently Asked Questions

  • Q: Does this kit fit Ford Sierra RS Cosworth YB engines?
    A: Yes, direct fit for 1986-1992 Sierra RS Cosworth and 1992-1996 Escort RS Cosworth 2.0L YB turbo engines.
  • Q: What material are these rod bolts made from?
    A: Heat-treated 8740 chromoly steel with rolled threads for high tensile strength and fatigue resistance.
  • Q: Is a stretch gauge required for installation?
    A: Recommended for torque-to-yield method to achieve proper clamp load, kit includes moly lube.

Shipping & Handling

  • Method: UPS/FedEx Ground
  • Availability: In stock - ships same or next business day
  • Packaging: Official ARP retail box
  • Weight: 0.35 lbs

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