Daniel5691

Hi !

1981 928S Euro M28.11 4.7L M220 LSD 5SPD CIS/KJET

I spoke with the gentlemen at the machine shop today and we were discussing my cylinder head rebuild. The machinists are incredibly conscientious and helpful, willing to spend time to explain the wizardry to an uneducated hobbyist like myself...

The current reference measurement for my heads is shown below....


The machinist provided me with the following reference data before he proceeds with the preparation of the cylinder head surface which mates with the block and is sealed by the head gasket:


The head surfaces all around all of the flame rings are solid, true, and flat,
NO GOUGING OR CORROSION anywhere within at least .75- 1.0 centimeters of the flame ring surfaces.

There is some very shallow surface corrosion back away from the flame rings, sparsely distributed. The machinist considered the extent inconsequential to the flame ring surfaces.

He would like to remove between 5 and 10 thousandths to prep the head surfaces.

I asked him to wait until I shared these details with the Rennlist Brain Trust, and he agreed. Could you provide insight into this particular situation?

My question:
>> based on these dimensions,
should I use a "stock" thickness head gasket,
or do I need a gasket which will make account for the planned 5-10 thousandths surfacing?

GlenL

Yes.

No.

You have 0.045 and they want to take 0.005 to 0.010.