For use with M-6010-A500 Ford Racing cylinder block, other blocks require modification to accept this head Used for professional competition: NHRA Pro-Stock Class Made from 356-T6 aluminum, with steel valve guides with a bronze liner, and a premium valve seat insert material compatible with titanium valves Raised intake and exhaust ports 65cc wedge-style combustion chamber 4.600" recommended bore size minimum 2.450" intake, 1.880" exhaust recommended valve diameters Shaft-mounted rocker arms and offset roller lifters required Wedge-style combustion chamber, canted valves and tall, high flow ports Requires custom made intake

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