I don't often bad mouth companies - but I ordered set of rings from CE ...and got them two months later.
Several international phone calls were made ...many times they didn't pick up - even though I had triple checked the time zones. I'm an experienced International parts shipper and buyer. ;)
Finally got the lame excuse that they'd forgotten to order them - then he posted them by SEA mail...
I wouldn't go near them for International orders.
Another doubt: what kind of headers and seals do I have to install to have that volume of combustion chamber?