ARP's L19 material (comparable to A1 Technologies H11 Tool Steel) is a premium steel that is processed to deliver superior strength and fatigue properties. L19 is a very high strength material compared with 8740 (standard ARP headstuds) and is capable of delivering a clamp load at 260,000 psi. It is primarily used in short track and drag racing applications where inertia loads exceed the clamping capability of ARP2000. 

Like most high strength, quench and temper steels - L19 requires special care during manufacturing to avoid hydrogen embrittlement. This material is easily contaminated and subject to stress corrosion. It must be kept well-oiled and not exposed to moisture. These come packaged individually wrapped in a special wax paper to prevent contact with moisture until ready to be used.

Because of the many head lifting issues on EJ20/EJ25 blocks running in excess of 30+ PSI, a stronger stud needed to be manufactured to meet the demands of today's top engine builders and racers alike.

Typical lead time on these studs is 6-8 weeks, But we have ordered these in advance and will be stocking them on the shelf! 

The L19 head stud upgrade comes with Studs, Washers, and Bolts for a complete installation. No Modification to your cylinder head or block is required as these are a direct drop-in replacement for the OEM head stud! 

Yield Strength: 200-230,000 PSI 
Tensile Strength: 260,000 PSI 


Ross Sport Europe was founded in 2006 by Ross Walker.

Ross has been a passionate Japanese car fanatic since the early 1990s, graduating up through many Japanese sports cars. When he got his first Evo, he was completely smitten with the entire package. Even to this day, nothing comparable has ever been produced by any manufacturer.

Ross Sport Europe was originally born out of the need to develop new parts to further improve the Evo. Initially, Ross was producing these for his own car and for fellow enthusiasts, but it quickly grew in to a small business and the rest was history!

Ross's involvement with Evo motorsport, together with his will to take the Evo platform further in terms of its performance, has led to a number of notable record achievements which still stand today.

In 2011, Gavin Taylor joined the Ross Sport Europe team, bringing a wealth of knowledge and extensive experience in both OEM and aftermarket Evo parts.

Ross Sport Europe's mission is to provide proven quality parts as well as the finest customer service and technical support in the industry.