Have your machinist be careful not to machine the pistons too much. You'll need at least .200'' wall thickness left on the piston tops. And that's pushing it at 18/20 #. 

Frank/Rebop

Bristol, In ( by Elkhart) 

Consider O ringing the heads [or block] and use copper head gaskets as well when you re-install.



"Came too close to dying to stop living now!"

What brand or company can I purchase copper head gaskets?  I haven't been able to find a source for different head gaskets.  If you could let me know that would be great.  It looks like if you shave just the dome off the piston it will not affect the thickness of the piston.

You will have to have them made.. Seppo has had some made but he is at the other end of the earth like me. There was a post quite recent about them. Ted, Tim or John may have a contact.



"Came too close to dying to stop living now!"

Copper head gaskets were advertised in YBM about a year or so ago. Maybe someone here can zero in on what issue?

Paul

http://www.y-blocksforever.com/forums/Topic71011-3-1.aspx 

here is the info on copper headgaskets.

Gary Ryan San Antonio.TX.

Wondering if the Hollow Heads could get some copper gaskets?  John is almost done with my heads.  If you have some cut I will buy them if not there is a shop in town with a cnc machine to cut them but if you could get me some that would be great.  Have you used many of them yet and how have they held up?

We can deliver plates for you. Just tell us how thick you want. Our first test for those plates will be at the end of June, cause our new bottom end has had some delays. So, we have no experience yet.

 Seppo from Järvenpää, Finland
www.hollowheads.net (just click the hole in the head to proceed)

I am not sure exactly what thickness I would need.  I would guess whatever a crushed gasket thickness would be.  Have you used any yet?  Do they require more torque and seal good?

I got my pistons back from being milled down and put back in my engine.  They look great and should make a much better combustion chamber.  My heads should be here hopefully monday.  I also ordered a Borg Warner S3008SX-66 turbo charger which will support up to 800 whp.  Should not run out of air this time.  Should have it back together by end of the week.  My old head gaskets also showed no signs of compression leakage what so ever.  They had about 1200 miles on them with 8-10 lbs of boost.  Will update on any progress.