thanks to everyone who has helped with this little problem i had well heads are ready gaskets on the way so onto valve clearance when i refit heads as I've read the rule of 9 does not work so i would guess clearance is checked between cam lobe and rocker arm and not rocker arm and valve and possibly on the lowest part of the cam i.e. opposite the lobe lift end is this correct or is there a cunning way to do this?
thanks again
See
http://www.lanciagammaconsortium.info//htmlfr/gamma003.htm#VAL