Originally posted by HonkyWhiteTrash
I can't believe no-one produced this info - yet if you want to know pre-crossflow or crossflow chamber size they're available! Maybe that's the difference between Ford and Lotus - Lotus liked to make things a mystery!

I've already made a guess at it - just wanted to know if my maths was good - i got 40.5-41cc's for a standard head and 36-36.5cc for big valve.