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Dart Machinery Pro-1 Aluminum Chev BB Head
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.
- Premium alloy: Cast from virgin 355-T61 aerospace alloy for superior strength and
integrity
- Bolt-on compatibility: 2 deg. 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 air/fuel 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 extend cylinder head life and reduce valve stem wear
Part Type: Cylinder Head
Application: Chevrolet Big Block
Cylinder Head Material: Aluminum
Bare or Assembled: Bare
Combustion Chamber Size: 121cc
CNC Machined Combustion Chambers: No
Intake Valve Angle: 24
Exhaust Valve Angle: 15
Intake Port Volume: 325cc
CNC Machined Intake Port: No
Intake Port Flow: 376 cfm @ .800" Lift/ 28"
Intake Port Location: Standard
Intake Port Shape: Rectangular
Intake Port Dimensions: 1.700" x 2.430"
Suggested Intake Gaskets: Fel-Pro 1275 or Equivalent
Exhaust Port Volume: 129cc
CNC Machined Exhaust Port: No
Exhaust Port Flow: 266 cfm @ .800" Lift/ 28"
Exhaust Port Location: Raised .300"
Exhaust Port Shape: Square
Exhaust Port Dimensions: 1.650" x 1.800"
Suggested Exhaust Gaskets: Fel-Pro 1412 or Equivalent
Suggested Spark Plug: .750" reach
Valve Guides: Yes
Valve Guide Spacing: Exhaust moved .045" away from Intake
Valve Stem Diameter: 11/32" (.3415")
Valve Seats: Yes
Valve Job: Multi-Angle
Intake Valve Diameter: 2.250"
Intake Valve Included: No
Exhaust Valve Diameter: 1.880"
Exhaust Valve Included: No
Suggested Valve Length: Intake: 5.475" (+.250"), Exhaust: 5.435" (stock)
Valve Spring Pockets: 1.740" O.D. (.030" deeper MAX.)
Valve Springs Included: No
Valve Spring Application: NA
Valve Springs Retainers Included: No
Valve Locks Included: No
Valve Seals Included: No
Rocker Studs Included: No
Guide Plates Included: No
Valve Cover Mounting Style: Perimeter bolt
Steam Holes Drilled: No
Heat Crossover: No
Suggested Head Bolts: ARP 135-3606 (w/Mark IV block)
Suggested Head Studs: ARP 235-4103
Suggested Stud Girdle: Power Products 13602K, Howards Cams 90121, Jomar 1114
Head Bolt Torque with Oil: 70 ft./lbs.
Rocker Stud Torque with Oil: 45 ft./lbs.
Intake Bolt Torque with Oil: 35 ft./lbs.
Manufacturer: Dart Machinery
Manufacturer's Part Number: 19200010
Weight: 29 lbs.
Warranty: Race Application, No warranty expressed or implied
Quantity: Sold as Each
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