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

Features:

- Premium alloy: Dart aluminum heads are cast from virgin 355-T61 aerospace alloy for superior strength and integrity

- Bolt on compatibility: 2 degree rolled valve angle and standard spacing accommodates all stock accessories

- Heart shaped 121cc chambers improve combustion efficiency

- CNC machining ensures that every chamber has the same volume so that every cylinder maintains equal compression

- Raised spark plug location improves flame travel for a quicker, more complete burn, producing more power

- Multi-angle intake seats and radiused exhaust seats greatly improve air flow

- Hardened exhaust seats are compatible with unleaded gasoline

- Exhaust ports raised .300" to improve flow (requires 1" longer head bolts next to exhaust ports)

- Spark plug holes are machined for gasketed 3/4" reach plugs

- Manganese bronze valve guides ensure long term reliability

- All cylinder heads sold individually