1989-1991      E30     320is [Portugal and Italy]

For mating

Early Model (up to 02/2003 production): M11 bolts

Toe in/out: If Ackermann is 0 or negative then toe is 2mm out

B58 Closed Deck Cylinder Head Mod SCR7568 1989-1991 E30 320is [Portugal and5150 AutoSport B58 Closed Deck Cylinder Head Modification Service High horsepower B58 engines are known to experience cylinder head sealing issues due to the coolant jacket design around the combustion chamber. Under extreme cylinder pressure, the factory head flexes and pushes compression into the cooling system, leading to: Cooling system over pressurization Coolant loss Head lift Head gasket failure Unsafe coolant discharge under racing conditions