Hello, you have a rare M90 engine block with a 93.40mm bore and 84mm stroke (like an M88). Be careful with the cylinder head gasket which is specific (Victor Reinz 02-25220-04 is OK) as well as the piston rings are very difficult to find and / or very expensive.
Thank you very much for the info! I also discovered this was the M90 engine. Pistons are out and will do a good inspection to all the parts. Update will be out soon. I'm having issues with my lift and the heat wave over here.
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![B1.31 - BMW E24 Project [Update time]](http://i.ytimg.com/vi/-pwk_96Qwms/mqdefault.jpg)
Hello, you have a rare M90 engine block with a 93.40mm bore and 84mm stroke (like an M88).
Be careful with the cylinder head gasket which is specific (Victor Reinz 02-25220-04 is OK) as well as the piston rings are very difficult to find and / or very expensive.
Thank you very much for the info! I also discovered this was the M90 engine. Pistons are out and will do a good inspection to all the parts. Update will be out soon. I'm having issues with my lift and the heat wave over here.