Athena Cut Ring racing head gasket 330144R - bore 85.50mm, thickness 2.00mm, for the BMW M50 (BMW OEM codes 11121726619 / 11121726617). Athena Cut Ring racing head gasket for motorsport and drag racing (race use only, not for street use). Cut Ring technology: separate recessed AISI 304 stainless-steel rings seal around the cylinder bores, so the engine block does not need to be machined for ring seats - no compression loss even with turbo and/or NOS boost above 2 bar. Gasket body in Athena Motorgasket (steel core covered with two layers of asbestos-free aramid fibre) with a silicone bead on the oil and coolant passages. Designed and made in Italy.