This is a Used Cylinder Head / Cylinder Assembly for a Porsche 935 / 956
This is a super rare Water Cooled Head beam welded to an Air Cooled Cylinder. This unit particular unit was from a 956 and is just the one bare assembly as pictured.
This is sold as racing memorabilia - It has lived on my desk for years and I haven't ever measured the bore or checked its useable condition. There is a red ink 'X' on the cylinder which I would assume means out of spec / end of useable life.
Take a look at pictures and let me know if you have any questions.
I had a few of these in the past - this is my last one.
New, these are No Longer Available - Get this rare display piece for $549.99 shipped to USA or Canada
