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Dart Race Series 18 Degree Cylinder Heads for Small Block Chevy

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Dart Race Series 18 degree cylinder heads (for small block Chevy) delivers features that put you ahead of the competition! Dart refined the rolled valve angle desig

Dart Race Series 18 degree cylinder heads (for small block Chevy) delivers features that put you ahead of the competition! Dart refined the rolled valve angle design to give you more versatility, more performance, more reliability and higher quality. Features include: * Premium alloy: Dart aluminum heads are cast from virgin 355-T61 aerospace alloy for superior strength and integrity * Shallow combustion chamber design to improve combustion and allow the use of larger valves for improved airflow * Refined intake port design reduces turbulence and improves air/fuel flow * 67cc as-cast chamber volume can be m

Dart Race Series 18 degree cylinder heads (for small block Chevy) delivers features that put you ahead of the competition! Dart refined the rolled valve angle design to give you more versatility, more performance, more reliability and higher quality. Features include: * Premium alloy: Dart aluminum heads are cast from virgin 355-T61 aerospace alloy for superior strength and integrity * Shallow combustion chamber design to improve combustion and allow the use of larger valves for improved airflow * Refined intake port design reduces turbulence and improves air/fuel flow * 67cc as-cast chamber volume can be machined down to 48cc * Interlocking ductile iron valve seats are compatible with stainless steel or titanium valves * Valve seats will accommodate up to 2.180 in. intake and 1.625 in. exhaust valves * Extra thick decks for 9:1 engines can be milled for high compression engines * Integral bosses can be drilled for fuel injection down nozzles * Intake runners can be ported to CNC ported to 250cc