Hints & Tips on modifying the Ford Alloy Head Crossflow 6 Cylinder Intake & Exhaust
From XRGlen on the xFalcon Forum: http://www.xfalcon.com/forum/showthread.php?t=19817

Valves:
1.84" inlet valves and just over standard, 1.56" exhaust valves..

Porting:
Exhaust:
No porting on the exhaust side, just a good bowl and seat job to get flow up in the low lift areas only.

Intake:
The inlet however gets the same as the exhaust as well as mild porting around the valve guide bosses which requires the bosses to be removed and while they were out Glen put them on the belt sander and gave them a 12mm or 1/2" taper on the section that protrudes into the port..
Also make the bowl area below the seat 88% of the width of the valve on both the inlet and exhaust.
Lastly, some more releivivg around the inlet swirl lip in the chamber.
Glen had already cut the section back but now he rounded the edge and blended it for better flow.
He's aiming to get each inlet port to flow the same as the aussiespeed 2 barrel inlet which flows around 212cfm per port.

The head will be flowed soon and figures will be listed in the thead linked to above.

Compression will now be 10.8:1 as Glen's block has already been decked a few years ago when used for another car so 10.8:1 it is.

All this along with Glen's new 650cfm 2 barrel holley should get him very close to the magic 300hp number.