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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
Stage 3 Assemblies include (Mechanical Roller to .800" lift): Stainless steel severe application valves, roller valve springs, 10 deg. titanium retainers, 10 deg. super locks, VTO super seals, spring seats, ARP rocker studs, and guide plates. Competition seat and guide work done on Serdi.
*Features titanium retainers
Part Type: Cylinder Head
Application: Chevrolet Big Block
Cylinder Head Material: Aluminum
Bare or Assembled: Assembled
Combustion Chamber Size: 121cc
CNC Machined Combustion Chambers: No
Intake Valve Angle: 24
Exhaust Valve Angle: 15
Intake Port Volume: 310cc
CNC Machined Intake Port: No
Intake Port Flow: 369 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: Yes
Exhaust Valve Diameter: 1.880"
Exhaust Valve Included: Yes
Suggested Valve Length: Intake: 5.475" (+.250") Exhaust: 5.435" (stock)
Valve Spring Pockets: 1.740" O.D. (.030" deeper MAX.)
Valve Springs Included: Yes, 1.625" Dual with Damper
Valve Spring Application: Mechanical Roller, 240lbs. Seat, 685lbs. Open, .800" Max Lift
Valve Springs Retainers Included: Yes (Titanium)
Valve Locks Included: Yes (10 Degree)
Valve Seals Included: Yes
Rocker Studs Included: Yes (7/16")
Guide Plates Included: Yes
Valve Cover Mounting Style: Perimeter Bolt
Steam Holes Drilled: No
Heat Crossover: No
Suggested Head Bolts: ARP 135-3603
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: 1910010 Stage 3 Assembled
Weight:
Warranty: Race Application, No warranty expressed or implied
Quantity: Sold as Pair
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