Originally Posted by BOBCRMAN@aol.com
The oval port head will hit the pistons on the exhaust side at the deck and outer edge of the dome.
I have the KB (25CC) domed pistons with 820 heads (the heads have the larger (rect port) valves w/machining to unshroud). When I assembled, the outer edge of the dome did hit inside the chamber (not the deck); which I clearanced with quite some effort. (I worked until they cleared w/o head gasket - this gives me plenty of clearance when installed with regular .041 compressed gaskets).
Bowtie - with 10.8 DCR, you will have big problems running pump gas.