Dart 19574030M Pro 1 BBC Head
2.300 Int / 1.880 Exh
Pro 1 BBC Marine 355 Cylinder Head
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.
- Premium alloy: Dart aluminum heads are cast from virgin
355-T61 aerospace alloy for superior strength and
- 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
- 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
- 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
- Manganese bronze valve guides ensure long term
- All cylinder heads sold individually.