Dart 19474030M

Every intake port, every exhaust port, every valve bowl and every combustion chamber is 100% CNC machined on special, dedicated Pro1 castings. Our 5-axis computer controlled machining centers produce compound curves and complex shapes with consistency<br><br>Features:<br><br>- Special hard chromate surface treatment for corrosion and erosion resistance. This treatment is also available on aluminum Dart blocks!<br><br>- Premium alloy: Dart aluminum heads are cast from virgin 355-T61 aerospace alloy for superior strength and integrity<br><br>- Bolt on compatibility: 2 degree rolled valve angle and standard spacing accommodates all stock accessories<br><br>- Heart shaped 121cc chambers improve combustion efficiency<br><br>- CNC machining ensures that every chamber has the same volume so that every cylinder maintains equal compression<br><br>- Raised spark plug location improves flame travel for a quicker, more complete burn, producing more power<br><br>- Multi-angle intake seats and radiused exhaust seats greatly improve air flow<br><br>- Hardened exhaust seats are compatible with unleaded gasoline<br><br>- Exhaust ports raised .300" to improve flow (requires 1" longer head bolts next to exhaust ports)<br><br>- Spark plug holes are machined for gasketed 3/4" reach plugs<br><br>- Manganese bronze valve guides ensure long term reliability<br><br>- All cylinder heads sold individually<br>