Every intake port, every exhaust port, every valve bowl and every combustion chamber is 100% CNC machined on special, dedicated Pro 1 castings. Our 5-axis computer controlled machining centers produce compound curves and complex shapes that no human could duplicate with a hand grinder.
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.
Application:
- 1965-1969 CHEVROLET 396 BIG BLOCK
- 1970-1972 CHEVROLET 402 BIG BLOCK
- 1961-1965 CHEVROLET 409 BIG BLOCK
- 1966-1969 CHEVROLET 427 BIG BLOCK
- 1970-2000 CHEVROLET 454 BIG BLOCK
- 1985-2010 CHEVROLET 502 BIG BLOCK
- 1970-2000 CHEVROLET 540 BIG BLOCK
- 1970-2000 CHEVROLET 555 BIG BLOCK
- 1970-2000 CHEVROLET 565 BIG BLOCK
- 1970-2010 CHEVROLET 632 BIG BLOCK
