Pelican Parts Forums - Perfectbore cylinders: No Gasket?

Pelican Parts Forums (http://forums.pelicanparts.com/index.php)

- 911 Engine Rebuilding Forum (http://forums.pelicanparts.com/forumdisplay.php?f=257)

- - Perfectbore cylinders: No Gasket? (http://forums.pelicanparts.com/showthread.php?t=413677)

Perfectbore cylinders: No Gasket?

I am assembling a set of new Perfect Bore 3.2 cylinders with my 3.0 heads that have been machined flat at the perimeter and "dished" a bit and twin-plugged. THe shop that does this is well known for their custom machine work and they had both the cylinders and heads (and pistons) to mock everything up before assembly.

I noticed there are no grooves in the Perfectbore cylinders.

http://forums.pelicanparts.com/uploa...1212977828.jpg

Is it acceptable to assemble them without any head gasket/sealing ring? All the engines I've done before used a sealing ring...

Not much info on the Perfect Bore website...

Thanks

Yep, pretty standard stuff. My 2.3 w/ Nickies is the same way. You'll notice Porsche ditched the CE rings on the 964, as well.