Originally Posted by grey_esp
Do standard 2V and 4V heads share the same rocker gear? and Valve springs? If not what is the differnce? rocker Ratio? Valve spring pressure?
All 2V and 4V heads should be the same specs except for the Oz 4V GT Closed Chamber heads which should have a 4 and a dot on the heads. I was told the dot meant they were machined for screw in studs and guide plates for the solid cam setup !!! I think the 4V Oz GT heads had around 120lb at the seat.
All Clevo heads have a 1.73:1 rocker ratio but the standard springs were around 85lb closed. I think the 4V Oz GT heads were just 70, 71 and 72 American Mustang Boss heads imported for Bathurst and shoved onto the Phase 3 and 4 and some lucky XA GTs and even some XBs.
Thats what I think anyway. I will c if I an post some pics of my 4V heads !!!