Cylinder heads dual port VW Beetle Street Racer version including machining for bigger cylinders 90,5-94mm, valve seats machined for super finish cut, including porting and machining your manifolds for super finish, intake valves 42mm/exhaust valves 37,5mm, longer spark plug (for M14 x 1,25 sparks), set for one engine (2 heads), including valves, springs and supplies, new parts.