Part #EV3PK... $1135
High squish adds maximum turbulence and combustion efficiency for bike running flat top, #EV30 or equivalent dome pistons.
• Weld & reshape combustion chamber
• Port & polish, install & size guides
• Valve job with blend
• "D" port exhaust & mill for compression
• Assembled with high flow valves, double spring kit for .550 lift cam* & Teflon seals.
• For stock valve sizes & 79/80cc welded bathtub chamber

OVERSIZED VALVE OPTION:
Add to EV Packages. Part #EV11... $110
Install oversized valve seats for 1-15/16" intake valves to get more mid-range and top-end power.

* Spring kit upgrade available for cams over .550 lift. See Upgrade Page.

80" 10.5:1 DOME TOP PISTON OPTION:
Add to EV3PK. Part #EV30
BC customizes Ross pistons for use with 30° squish bathtub chamber heads. Squish provides additional turbulence, thoroughly mixing air and fuel for more efficient combustion with less detonation.
Option includes:
• Ross Piston Set with pins and rings
• Modify bathtub chamber