Cylinder Head Specifications

• Intake Port Volume: 320cc - Rectangle Port
• Combustion Chamber Volume: 119cc
• Stainless Steel Valves: 2.250" dia. x 5.318" (+.100") o.a.l. Intake / 1.880" dia. x 5.494" (+.100") o.a.l. Exhaust ( 11/32" Stem Diameter )
• Valve Springs: Double Spring; 1.625" Diameter - Open Pressure: 745 lbs.; Closed Pressure: 250 lbs.; Installed Height: 2.050"; Max Lift: .800"
• Spring Retainers: 1.625" 10° Titanium
• Valve Seals: 11/32"
• Spark Plug Configuration: Angled

Facts and Related Components

• Torque Heads: 70 ft-lb.
• Torque Rocker Studs: 40-45 ft-lb.
• Intake Gasket: Brodix p/n 158-MG2001, Cometic p/n 245-C5428, Fel-Pro p/n 375-1252-3
• Head Gasket: 4.310' Bore - Fel-Pro p/n 375-1027, Cometic p/n 245-C5432; 4.540' Bore - Fel-Pro p/n 375-1017, Cometic p/n 245-C5433
• Exhaust Gasket: Fel-Pro p/n 375-1411 or Cometic p/n 245-C5429
• Head Bolts: ARP p/n 070-135-3606, Manley p/n 660-42192 Bolts / 42102 Washers
• Head Studs: ARP p/n 070-235-4702 (12-point)
• Spark Plug Specs: 14mm Thread, .750' (3/4') Reach, Gasket Seat
• Valve Angle: 26° and 4° Intake, 17° and 4° Exhaust
• Angle Milling: .0066' per cc
• Flat Milling: .0050' per cc
• Pushrod Slots: Standard
• Pushrods: Check pushrod clearance with head installed on the engine block before final assembly
• Stud Girdle: Standard BB-Chevy, Brodix p/n 158-1230
• Rocker Arms: Standard BB-Chevy
• Lifters: Standard
• Pistons: Standard BB-Chevy
• Valve Centerline: Standard BB-Chevy
• Exhaust Pattern: Raised .600"
• Spring Pockets: May not be cut any larger or deeper than 1.625'
• Accessory Bolt Holes are Drilled
• Recommended Intake Manifold: Brodix BM 2000 (p/n 158-BM2000) / HV 2001 (p/n 158-HV2001)

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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