This head comes as a brand new assembly from cosworth, no core required. It is CNC ported and hand finish blended, and the consistency between cylinders is excellent. Far better than what I've bought in the past done by hand.
Here are some of the specs i've been given
• CNC Ported - New Castings
• Hand blended finish work
• Intake –20% (max) increased flow
• Exhaust – 22% (max) increased flow
• 4-angle Inlet Valve job
• 3-angle & radius Exhaust Valve job
• Valves are lapped
• Back-Cut Inlet Valves
• Heads are Ultra Sonic cleaned prior to assembly
• Heads are Serialized and sport a machined Cosworth logo
• +1mm Stainless Steel Intake Valves (1800 degrees max.)
• +1mm Inconel Exhaust Valves (2400 degrees max.)
• Performance Valve Springs
• Titanium Retainers
• Hardened Steel Spring Platforms
• Knife edged port divider
The head is designed for strong torque, and turbo response. valve springs are rated to 10,500 rpm.
Not sure when we are going to get the chance to test this head on a car ourselves but with a GT turbo and good set of cams, this head should produce some good performance numbers.
Former Sponsor
It's great that Cosworth published flow figures with their product 
If you look at the exhaust flow it is greatly increased at low lift, i was told by cosworth that this improves spool when moving to a bigger turbo.
Evolving Member
Def. feeling the intake side. I wonder if designing for laminer flow is what they were aiming for here....
Evolved Member
Damn thats badass. Ill give you a call when I win the Pick5 here in Jersey.
Former Sponsor
Quote:
Not AS expensive Originally Posted by nickracer9
its still expensive with a merchant account!
Evolving Member
Would you mind taking one intake and one exhaust valve off and taking a close up shot of the port-seat-chamber transitions and angles?
Evolving Member
Quote:
Looks like they were aiming for the critical Reynold's Number, the transition between laminar and turbulent flow. That's often where you see a dip in the resistance to flow. Originally Posted by FastEvoFL
Def. feeling the intake side. I wonder if designing for laminer flow is what they were aiming for here....
It's a bit like scuffing up a baseball so you can throw it faster. Roughing the surface of the ball moves the critical Reynolds number to within the speed-range at which the pitcher can throw, thus allowing him to throw slightly faster.
If you were to polish the ports, the transition would happen at a higher RPM.