More bore / thickness options are available here

040" Peak Lift Center Line Intake 284°

the R3CS Clutch is the go-to choice for competition drift and drag vehicles as well as Dakar Rally-type vehicles

1982 - 1984       BMW E30       323i

4 low-side auxiliary outputs for meth

B58 Valve Guides 535 More bore / thickness optionsOur HD bronze valve guides for the BMW B58 engine are engineered for high performance, high boost applications where OEM materials reach their limits. These guides replace the factory BMW valve guides in the cylinder head (intake and exhaust assemblies). Built to withstand elevated temperatures, increased valve spring pressures, and sustained high RPM operation, they deliver exceptional stability and durability under demanding conditions. Machined