Alp,
You and your Triumph engine land speed bike are all wrong!
The motor's undersquare bore to stroke is antiquated
The stroke is too long for sustained high RPM
The hemi head combustion chamber has too much surface area
The camshaft lift can't be enlarged because the cam will hit the tappet guides
The rocker arm ratio can't be altered because the pushrods will hit the pushrod tubes
Even if you could improve valve lift, the exhaust valve would hit the intake valve at overlap
The 2 bearing crankshaft is too weak
Your carburetors are dinosaurs
Your exhaust is too long
Your intakes are too short
Your bike is too high
You are too big for it! You look like a gazelle on a bicycle!
You should get a smaller rider to go really fast!
BSA RULES!Tom