DART Pro 1 CNC BBC Cyl Head; 1.625 Dual Springs CHEVROLET 409 BIG BLOCK


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Part #: 19574136
Notes: Pro 1 CNC BBC Cyl Head
1.625 Dual Springs
MSRP: $2,324.92
Your Price: $2,003.33
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Specs

Comb Chamber 121cc
Intake Runners 355cc
Valves 2.300 Int / 1.880 Exh

All Fitments

CHEVROLET
Year Model SubModel Cylinders Liter Aspiration Eng Desg. Fuel Notes
1965 - 1969 396 BIG BLOCK ALL ALL ALL ALL ALL ALL
1970 - 1972 402 BIG BLOCK ALL ALL ALL ALL ALL ALL
1961 - 1965 409 BIG BLOCK ALL ALL ALL ALL ALL ALL
1966 - 1969 427 BIG BLOCK ALL ALL ALL ALL ALL ALL
1970 - 2000 454 BIG BLOCK ALL ALL ALL ALL ALL ALL
1985 - 2010 502 BIG BLOCK ALL ALL ALL ALL ALL ALL
1970 - 2000 540 BIG BLOCK ALL ALL ALL ALL ALL ALL
1970 - 2000 555 BIG BLOCK ALL ALL ALL ALL ALL ALL
1970 - 2000 565 BIG BLOCK ALL ALL ALL ALL ALL ALL
1970 - 2010 632 BIG BLOCK ALL ALL ALL ALL ALL ALL

Product Description

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.

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