We highly recommend RK Autowerks in Texas USA
The valve seal utilizes a Viton O-ring that is clamped in place to prevent the possibility of sticking to the seat and pulling out
The use of 6061 aluminum allows the housing to be anodized with a selection of colors
any order undergoes an exacting Quality Control Test
These components are prone to shearing or breaking of the lock splines
5150 AutoSport Head Gasket & Head Stud Kit, BMW M40/M42/M43/M44 Head Stud Kit:ARP2000 We highly recommend RK AutowerksMLS Head Gasket: This Cometic MLS Head Gasket is specifically engineered to replace BMW part # 11121721546, 11121721547, 11121721550, 11121721551 for the M40B16, M40B18, M42 B18, or M44 B19 engine. Multi Layer Steel also known as "MLS" head gaskets are preferred as an aftermarket alternative for high performance BMW engines, including supercharged and turbocharged models, as they offer better performance than factory gaskets. The M40 and M42 factory