valve guides BMW
bigger lightweight valves
bigger bronze valve seats (inner diameter of intake valve 33mm, outer diameter of intake valve 34)
enlarged gasroots: intake 33mm, exhaust 31mm
Combustion chamber's is enlarged around tha valves for better filling. Also top of the combustion chamber is stimmed by 1.5mm for dicreasing of the compression ratio.
Great on high revs. Great for turbo.

Springs, rockers, camshaft bearings and camshaft are not included.