Speedmaster CNC chamber cc's

Bobzilla said

Please specify if you guys checked a CNC chamber or an as-cast chamber. The CNC ports have been delivered both ways, according to other threads. I think bare CNC version was an untouched as-cast chamber and the assembled CNC version had the chamber CNC cut as well. So the sizes may be different.

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Sorry, I covered all that when I posted in the AM inspection thread and didn't think to post it all again.

The numbers for the as cast head are probably accurate.

The assembled CNC heads all come with no chamber work, and are list as 68cc. That's inaccurate. I measured them and They have the same 65cc chamber as the unported heads. The runner volume is accurate at 188cc as measured.

The bare CNC heads come with a CNC chamber, there's only one person I know of for sure that has those, and he hasn't posted any data.