Inspired by our championship winning Pro Stock designs, the Pro 1's race proven features include rolled valve angles, improved spark plug location, extra long intake valves, raised exhaust ports and fast burn chambers - Yet the Pro 1 can be used with off the shelf pistons, valve train components and intake manifolds.

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.

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

- Multi-angle intake seats and radiused exhaust seats dramatically increase airflow.

- 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 extend cylinder head life and reduce stem wear.

- All cylinder heads are sold individually.