Try www.Kormanfastbmw.com What are the valve sizes on the E21 4 cil models? t the head equal to the one inthe 1602/ 1802/2002? what differs? the ports? The 1.8 engine has 89mm bore but the head is the same as the 320? I know that in the 1802( 1.8) the 118(same as 1602) is used. Is there any site were I can get a list relativ to E21 head specs?