Originally Posted by Maki
Originally Posted by stuart collins
i run standard valves on mine and the head has flown : over 350 bhp at the mo , will see more now when the boost is turn up and the map finished
That sounds interesting
I'm thinking about enlagring both on my project ZVH that should give plus 20 HP easy
Not necesarily!! seek advice from a reputable engine builder,big isnt always best, size of valves and port shape depend upon the cam/s profile n lift etc, and decent machinist will use a flow bench to monitor flow and then this is fettled to suit the cam,No two engines are the same