What size O-ring and how deep a groove?

[Anlushac11]

I talked to machine shop today to see about getting block cut for O-rings to run the copper head gasket.

He said he needed to know what size O-ring I wanted and how deep a groove to cut?

He mentioned .042" O-ring and .021" groove in block.

I have the Classic Inlines .080" copper head gasket. Also, would it be a good idea to take in my head stud kit so the machinist can use it to locate the copper head gasket?

Thanks in advance for any help.

 

[CNC-Dude]

At only .021 deep with a .042 wire, the widest part of the wire is hardly inside the groove, if at all. Typical O-ring protusion above the deck is in the .008-.010 range with that size wire. It might be a good idea to take the gasket in case it needs to be "massaged" for clearance around any bolt holes or cylinders. You definately don't want it to overhang into a cylinder, even slightly. Make sure you have at least .050-.060 minumum distance from the edge of the cylinders to the gasket, copper likes to "squash" when torqued because of its soft nature, so give yourself a little extra of a buffer in that area....

 

[Does10s]

If I recall we're running .030" stainless wire on ours.
And just like CNC Dude said it only needs to be above the deck by around .010".

Will

 

[Anlushac11]

Thanks for the info.

Its going in for surgery tomorrow morning.