Before
The Heads
We used Pro Filer's 12-degree Hitman cylinder heads because DNE has built several engines with them and had the experience to make prepping these heads for our motor fairly painless. Dave sent the bare heads to MBE Performance Parts to have the chambers blended, a 5 angle valve job performed, and the runners cleaned up. The exhaust ports are huge to begin with, so those were left untouched. For an as-cast part, out of the box, these heads are pretty nice, and the work that MBE did really took these heads to competition level quality. The 12-degree valve angle promotes high-speed airflow into the chambers, and the port designs work really well in a naturally aspirated configuration. After the port work was finished, Dave chucked the heads into his mill to clearance the intake ports for the pushrods. We also spent a considerable amount of time cc'ing every single port and chamber as part of the design phase of this engine. Here's how the heads spec'd out after the port work:
(Flowed on a Super Flow 1020 bench at 28 inches of water)
Intake runner: 507 cfm
Exhaust runner: 319 cfm
Intake port volume: 475 cc
Exhaust port volume: 187 cc
Chamber volume: 55.5 cc
According to Dave, with this chamber volume the compression ratio is around 12:1 and, based upon previous engines he's built that are still running, is completely safe as long as you pay attention to the details and maintenance required of an engine like this one.
After | 
Exhaust Port | 
Intake Port |