This one is already sold and boxed up. the next one that comes which belongs to me, ill take out the valves and see whatsup.

 

haha thats right, dont get too many finger prints on my head

 

 

Hp to cost i dont think its worth it but you can match cnc

 

no doubt the head is expensive, but it is built with top of the line components and machine work, and is brand new never used. all the clearances are correct with no "surprises".

Comparable Ferrea valves run about $500. Their valve train also $500. You would then have to bring this stuff to a machine shop which may not be able to hold the tolerances for the valve job as good as cosworth, and you wouldn't get the cosworth angle spec valve job. Good machine work, and proper install height on the valve train, is just as important as having someone who knows how to port a head to make it flow. A guy could be a great head porter, but if he cant get the machine work done right (valve job run out, ect) the head isn't going to make power.

 

nice stuff....

 

i wish they had a core replacement service....
would definitely save me some money.

$3800 is alot to fork out on one product

 

 

One thing that you guys can do to save some money is sell your stock head

 

what cams do they recomend with this head?

 

Cosworth recommen using their own spec of cams or you can go with JUN cams

 

Lots of race engine machine shops in the US have the equipment to cut valve jobs to the required tight tolerances - relatively ordinary equipment that is used even at very high levels where work volume is low.

What is lacking is operator attention to detail. Probably only the top 3 or so big name, medium volume public-consumption facilities in the US to get a particular type of import head machined will do it right, and even that is unconfirmed.

If someone will get close shots (I mean at least ~1 inch supermacro on a 6 megapixel or higher, camera) of the Cosworth valvejob and blend, they will show the precision of blend as well as whether or not Cosworth used highly accurate, but expensive and exclusive, high spindle speed single point cutting systems.

Cosworth will definitely do a good job and exceeed many big names, but don't make assume you are getting something that no one else can match or exceed with simple equipment and lots of dedication. Have to at least confirm level of dedication of the street division of Cosworth, and that only comes in the form of very detailed specification and testing, or by even more racing or direct application comparison. So far there has been none of this because of how new the products are.

Unpleasant fact of life is that these days anyone with CNC and basic forms of metrology, can replicate every area of your head to perfection. Anything revolutionary and out in the open doesn't stay that way more than an instant. They also have to match on manufacturing cost and California is expensive vs other parts of the US. Cosworth US division also runs fractional R&D capability vs the main UK facility.

Almost always it is the other way round, especially with modern machines which are easy to run compared to older ones. Good porters almost always make excellent head machinists, whereas good head machinists might or might not be good porters, and more often that not aren't great at porting. Good porters are just really rare.

 

I am assuming the Cosworth charts are at 28".

What bore were they flowed on?

 

When my head comes in i'll take out the valves.

 

I got carried away typing.

Don't mean to suggest this thing is not worth it. Considering it is a new head and that in all probability it is tops, and the price isn't at all crazy, I would buy it.

From what little is visible in the pictures, it is a good piece. The spring aspect ratio is nice, as is the retainer that is turned down to less than outer spring OD.

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Since the springs will be off in order to take earlier mentioned photos, would you mind sliding the inner spring through the outer spring and seeing how much, if any, interference exists between the two? If you have dial calipers handy you can measure the inner spring OD and outer spring ID and quantify interference.

If the head comes with a build sheet maybe you could share the seat and open pressures and their respective heights? Or if you have a spring tester handy can you pick two points and give their height and pressures so we can arrive at rate? Valve, retainer, spring, lock weights, all will be nice to have. It will be good data to have to start records with on different 4G63 package heads from different companies. No better place to start than with a big name race company's product.

Thanks a lot