Components

• Full CNC Ported Combustion Chambers
• Full CNC Ported Exhaust Ports
• Full CNC Ported Intake Ports
• Competition 5-Angle Valve Job
• Intake Valve, 2.125 in.
• Exhaust Valve, 1.600 in.
• Dual Valve Spring: Solid roller, 1.550 in. OD , .800 in. maximum lift, max RPM 8000-8200, 250 lbs. on seat
• Titanium Retainers
• 10 Degree Valve Locks w/ Lachcap recess
• ARP 7/16 in. Rocker Studs
• Adjustable 5/16 in. Guide Plates
• 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

• Requires shaft mount rocker arms for best geometry (.050 in. offset rockers in drag race applications only)
• Head Torque w/Moly Lube: 65-70 ft.-lbs.
• Rocker Stud Torque: 55 ft.-lbs.
• Intake Port Dimension, 2.200 in. x 1.290 in. w/ 5/16 in. radius
• Fel-Pro 375-1206 - DO NOT PORT MATCH Intake Manifold to Fel-Pro Gasket.
• Head Gasket: 350 ci Fel Pro 375-1004, 400 ci Fel Pro 375-1014
• Stud Girdle: Offset
• Spark Plug Starting Range Autolite 3922 (14mm x .750 in. Gasket Seat)
• Combustion Chambers: 70 cc
• Intake Port: 235 cc
• Exhaust Port: 80 cc raised .250 in.
• Spring Pocket: 1.580 OD; Max Machine: 1.680 in. OD
• Deck Thickness: .750 in.
• Valve Spacing: 60/40
• 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
• Permeter bolt valve cover

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: 159 
• .300: 221
• .400: 261
• .500: 295
• .550: 311
• .600: 318
• .650: 327
• .700: 331
• .800: 336

Exhaust: 

• .200: 120
• .300: 165
• .400: 214
• .500: 228
• .550: 237
• .600: 238
• .650: 243
• .700: 245
• .800: 250

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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