Precision engineered to the highest European replacement specifications, the complete range of Gröhl quality approved diesel cylinder heads are manufactured according to DIN ISO 9001:2000 certification, attained with DEKRA Germany. Standard Gröhl quality approved cylinder heads are supplied bare with guides, inserts and welsh plugs. Optional complete units are also available – assembled with the highest quality valve train components from reliable OE manufacturers such as TRW and KS Germany.