| Evolution Sportster Mod's open up the possibility for power. Many valve sizes and chamber/port shape combinations are available. Call to discuss your exact needs.
Part #EVS1PK
Cylinder head modifications that open up the potential of your EV Sportster/Buell heads. Many castings have the ability to use larger valves without installing bigger seats.
• Port & polish
• Install & size guides
• Valve job with blend
• Adjust for compression
Assemble with BC's parts: (No customer supplied parts.)
• Quality coated valves (call for size options)
• Double spring kit for .550 lift cams
• Teflon seals
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WELDING OPTION:
Add to EVS1PK. Part #EVS10
This option goes beyond the limitations of the factory casting. Adding material to critical areas allows for further performance increases.
OVERSIZED VALVE OPTION:
Add to EVS1PK. Part #EVS11
Install oversized valve seats for bigger valves. Final option for maximum performance.
FACTORY 883 TO 1200 CONVERSION:
Part #EVS5
Modify for desired compression and increased valve size to boost airflow.
• Modify chambers
• Flycut pockets
• Valve job
• 1200 conversion valves
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Improve performance using existing valves and springs. To maximize output, consider either the welding option and/or the oversized valve option. Due to the large number of different configurations available, we are unable list all the possibilities. Call us to discuss the performance potential of your Aftermarket Heads.
Part #AM1
• Port & polish
• Install & size guides
• Valve job with blend
• Adjust for compression
• No assembly & no parts
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WELDING OPTION: reshape ports and/or chambers for increased flow and/or compression.
OVERSIZED VALVE OPTION: maximize valve sizes for increased air flow.
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