2 replies to this topic

[minimole]

I have had search but had no luck.

I am just wondering on the valves sizes on a cooper s (11 stud jobbie) head and also other after maket valve sizes (i.e stage 2/3 head)

[miniboo]

not sure of the actual figures but keith calvers website has different stage heads and they say whay the valve sizes are.

I think that a cooper s head is roughly a stage 3....i think

[Guess-Works.com]

Cooper "S" heads have 1.4" inlet and 1.21" exhausts

Austin 1300 GT (11 Stud) & MG Metro (9 Stud) heads have 1.4" inlets and 1.15" exhausts

1275 GT heads have 1.31" inlets and 1.15" exhausts, as do must other metro heads