![Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade](https://portcylinderhead.com/wp-content/photos/Genuine_BMW_E21_E30_323i_M20B23_Cylinder_Head_1983_Big_Port_Version_E21_Upgrade_01_bkt.jpg)
![Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade](https://portcylinderhead.com/wp-content/photos/Genuine_BMW_E21_E30_323i_M20B23_Cylinder_Head_1983_Big_Port_Version_E21_Upgrade_02_tglp.jpg)
![Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade](https://portcylinderhead.com/wp-content/photos/Genuine_BMW_E21_E30_323i_M20B23_Cylinder_Head_1983_Big_Port_Version_E21_Upgrade_03_sji.jpg)
![Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade](https://portcylinderhead.com/wp-content/photos/Genuine_BMW_E21_E30_323i_M20B23_Cylinder_Head_1983_Big_Port_Version_E21_Upgrade_04_cv.jpg)
![Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade](https://portcylinderhead.com/wp-content/photos/Genuine_BMW_E21_E30_323i_M20B23_Cylinder_Head_1983_Big_Port_Version_E21_Upgrade_05_aw.jpg)
![Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade](https://portcylinderhead.com/wp-content/photos/Genuine_BMW_E21_E30_323i_M20B23_Cylinder_Head_1983_Big_Port_Version_E21_Upgrade_06_thw.jpg)
![Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade](https://portcylinderhead.com/wp-content/photos/macala.gif)
BMW m20b23 1983 cylinder head very clean inside. Had rebuild then only did a couple of thousand miles. Believed to have larger profile cam as when fitted to my e21 it made a very healthy amount of power on the Dyno if I remember it was around 160bhp which is better than the stock 141bhp. This head has larger ports than the e21 head so a fantastic upgrade for 320/6 and 323i engines.
![Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade Genuine BMW E21 E30 323i M20B23 Cylinder Head 1983 Big Port Version E21 Upgrade](https://portcylinderhead.com/wp-content/photos/macala.gif)