XScream custom billet 7 port power valve cylinder. This +10mm stroker amateur competition short block uses 85mm pistons for 885cc displacement (1 over bore remaining to 85.5mm). 

Short Block Includes: 
	
X Scream Custom billet 7 port power valve cylinder 
	
XScream Billet Head & Domes 
	
Wiseco Pistons 
	
Modified Yamaha 62T cases - Includes XScream epoxy and finger port work, reinforcing front seal area with epoxy, installing a second pulse line fitting, CNC work to match the top case to larger transfer ports on the billet power valve cylinder and boring the cases to accept the +10mm stroker crank. 
	
78mm Billet Stroker Crankshaft (+10mm) 

- Requires Boyesen RAD Valve intake, XScream XS900 Custom Intake or a Riva reed spacer 

- Also available as top end kit 

This was the engine Daniel Martin won the 2012 Amateur World Finals with.