Beam Heads?

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Hi,

I remember seeing somewhere that cosworth used a 'beam' type cylinder head on its last V10's. Does anyone have any more information on these heads, or know how the sealed them? and most importantly the advantages/disadvantages of using them, or was it purely for weight reduction?

This is all i could find myself
http://www.racecar-engineering.com/alla ... ngine.html


Cheers