377cc Rectangle Port 24° Magnum Aluminum Cylinder Heads
• Big Block Chevy
• 121cc Combustion Chambers
• Assembled
• Sold in Pairs, 2/pkg.
  
  
  

  Big Block Chevy 377cc Rectangle Port 24° Magnum Basic Package Components
  100% CNC Ported Combustion Chambers
  100% CNC Ported Exhaust Ports
  100% CNC Ported Intake Ports
  Competition 5-Angle Valve Job
  Intake Valve, 2.300' x 5.500' Overall Valve Length
  Exhaust Valve, 1.880' x 5.442' Overall Valve Length
  1.625' OD PAC Racing Solid Roller Valve Spring, 275 lbs. on seat, .850' maximum lift, max RPM 7400-7600
  10º Titanium Retainers
  10º Chrome Moly Valve Locks
  7/16' Rocker Studs
  Adjustable 3/8' Guide Plates
  Viton Valve Seals
  Hardened Spring Seat
  Intake Valve Seats
  Exhaust Valve Seats
  Bronze Valve Guides
  Big Block Chevy 377cc Rectangle Port 24° Magnum Head Specifications
  Head Torque w/Moly Lube	75 Ft. Lbs.
  Rocker Stud Torque	55 Ft. Lbs.
  Intake Port Gasket, 1.775' x 2.500' with 1/2' radius	Fel-Pro 375-1275 - DO NOT PORT MATCH Intake Manifold to Fel-Pro Gasket.
  Exhaust Port Gasket	AFR 033-6858
  Head Gasket Mark IV	4.540' Bore, Fel Pro 375-1017 AFR 033-6850
  Head Gasket Mark V - VI	Up to 4.500' Bore, Fel Pro 375-1047
  Head Gasket Mark V - VI	4.500' to 4.600' Bore, Fel Pro 375-17049
  Head Bolts & Studs	Standard ARP
  Head Bolt Washers	Manley Standard
  Stud Girdle	AFR 033-6210
  Suggested Manifold	Edelbrock 350-2907 & 350-2927 or Brodix 158-HV2000 & 158-HV2001
  Spark Plug Starting Range	Champion C59C, Autolite 3932
  Combustion Chambers	121cc Fully CNC'd
  Intake Port Volume	377cc Fully Ported
  Exhaust Port Volume	N/A
  Spring Pocket can be cut to 1.750, no deeper.
  Valve Spacing	Standard
  Rocker Arms	Standard
  Valve Angle	24° / 4° Intake ; 15° / 4° Exhaust
  Angle Mill, 104cc Maximum	.009' per cc
  Flat Mill, As Cast 108cc, CNC 114cc Maximum	.006' per cc
  NOTE:	Flat and Angle mills might require a .120' thick head gasket.

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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