8412 x 1 pair. A High Quality pair of Rolon Brand Valve Timing Chains for 3.4, 3.8 and 4.2 Jaguar XK Series Engines.  

Rolon chains are designed and manufactured to exacting standards, employing leading edge technology, material selection, tooling, heat treatment and manufacturing methods. Rolon chain, pins and bushes are provided with optimum surface hardness through skilled use of heat treatment for long durability.  All plates and rollers are shot peened to improve fatigue life. Shot peening induces compressive forces in these parts and therefore offers high resistance against fatigue and impact loading. Preloading ( stretching) of the chain is enabled in special fixtures. This enhances resistance against initial elongation and fatigue. All chains are subject to precise length control and the wider waist of Rolon link plates, combined with optimum press fitted bushes and pins, ensures greater fatigue strength.  Wear life also depends upon the perfect roundness of the cylindrical parts like pins and bushes so Rolon bushings are curl formed from in-house manufactured, specially processed steel to achieve complete round shape with uniform wall thickness. Pins are produced in special purpose made machines to achieve improved roundness.

Rolon timing chains offer the advantages of  higher priced timing chains but at a very competetive price. Original  Number C2255 & C2256