| | This semi-machined head (requires machining and porting) features high-quality aluminum casting. Designed for race applications. Special features include a unique valve cover design, 5/16" valve stem size, unique 6-bolt cylinder head mounting design for improved sealing and unique valve angles (10° intake, 2° exhaust). For use with "R4" Cast Iron Block P5007151 and A-4 Cylinder Block P5007467. | 
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