As for size... the Aurora ports support more than 120 percent volumetric efficiency, on methanol, at 10,500 rpm. And the intake port diameter is 34.5mm throughout. That's right. Smaller than a stock LT5. Mind you, the straight shot of the ports allow extremely high charge velocity. They flow more than 95 cfm per square inch of valve area--that's more than 360 cfm @ .500 lift. 34.5mm ports.
Notice how much of the valve seat area you can see when looking down into the port. Probably 80% of the valve area is visible from the entrance of the port.
The combustion chamber. 22cc's for a 93mm bore. Very typical for the 4-valve modern racing design. Notice the cones around the valve seats to help the air recover pressure as it enter the cylinder. And the significant squish area between the two intake and two exhaust valves.
