Components

• Full CNC Ported Combustion Chambers
• Full CNC Ported Exhaust Ports
• Full CNC Ported Intake Ports
• Competition 5-Angle Valve Job
• Viton Valve Seals: .600 in. OD x .495 in. ID
• Hardened Spring Cups: 1.550 in. OD x .780 in. ID
• Intake Valve Seats: Ductile Iron 2.200 in. OD, 1.750 in. ID, .375 in. Deep
• Exhaust Valve Seats: Ductile Iron 1.696 in. OD, 1.325 in. ID, .305 in. Deep
• 8 mm Bronze Valve Guides: .502 in. OD x 2.100 in. OAL

Head Specifications

• Head Torque w/Moly Lube: 65-70 ft.-lbs.
• Rocker Stud Torque: 55 ft.-lbs.
• Intake Port Gasket, 1.310 in. x 2.180 in. w/ 3/8 in. radius
• Fel-Pro 375-1206 - DO NOT PORT MATCH Intake Manifold to Fel-Pro Gasket.
• Head Gasket: 350 ci Fel Pro 375-1003, 400 ci Fel Pro 375-1014
• Stud Girdle: Standard
• Spark Plug Starting Range Autolite 3910 (14mm x .750 in. Gasket Seat)
• Combustion Chambers: 75 cc
• Intake Valve Size, 2.100 in.
• Exhaust Valve Size, 1.600 in.
• Intake Port: 220 cc
• Exhaust Port: 80 cc
• Spring Pocket can be cut to 1.750, no deeper.
• Valve Spacing: Standard GM
• Rocker Arms: Standard
• Valve Angle: 23 Degree
• Angle Mill: .008 in. per 55 cc
• Flat Mill .006 in. per 60 cc
• Flat and Angle mills might require a .120 in. thick head gasket.
• Requires a minimum 4 in. Bore

Head Flow

Tested conducted at 28 in. of water pressure on Superflow 600 w/ 4.155 in. bore, 3/4 in. radius plate exhaust, 1 7/8 in. curved pipe

Intake:                                                            

• .200: 145 
• .300: 207
• .400: 263
• .500: 299
• .550: 312
• .600: 316
• .650: 322
• .700: 326

Exhaust: 

• .200: 120
• .300: 160
• .400: 214
• .500: 225
• .550: 229
• .600: 240
• .650: 244
• .700: 245

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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