there is high rpm springs avalable, if i get a case made up i might get them to put the difrence of the cam on the end of the pump, but i think it should be fine, there is a guy who has been running a 4mm cam plate with stock springs now for 20000 miles so....
and did you guys know the was a company across the lake making 16mm heads for our pumps but they stoped because they wouldnt last long