265cc Oval Port 24 Degree Magnum Street Aluminum Cylinder Heads
• Big Block Chevy
• 113cc Combustion Chambers
• 1.550 in. Hydraulic Roller Dual Valve Spring
• Assembled
• Pair
  
  

  Big Block Chevy 265cc Oval Port 24° Magnum Basic Package Components
  50% CNC Ported Combustion Chambers
  40% CNC Ported Exhaust Ports (Bowl Blend)
  80% CNC Ported Intake Ports (Bowl Blend) & Gasket Port Match
  Competition 5-Angle Valve Job
  Intake Valve, 2.190' x 5.460' o.a.l.
  Exhaust Valve, 1.880' x 5.448' o.a.l.
  1.550' OD Hydraulic Roller Dual Valve Spring, 170 lbs. on seat, 473 lbs @ .600' maximum lift, max RPM 6300-6500
  10º 1.450' Chrome Moly Retainers
  10º 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 265cc Oval Port 24° Magnum Street Head Specifications
  Head Torque w/Moly Lube	75 Ft. Lbs.
  Rocker Stud Torque	55 Ft. Lbs.
  Intake Port Gasket	Fel-Pro 375-1212 - DO NOT PORT MATCH Intake Manifold to Fel-Pro Gasket.
  Exhaust Port Gasket	AFR 033-6858
  Head Gasket	4.540' Bore, Fel Pro 375-1017 AFR 033-6850
  Head Bolts & Studs	Standard ARP
  Head Bolt Washers	Manley Standard
  Stud Girdle	AFR 033-6210
  Suggested Manifold	Weiand Stealth or Edelbrock Vic Jr. or RPM Performer
  Spark Plug Starting Range	Autolite 3935
  Combustion Chambers	113cc As Cast
  Intake Port Volume	265cc As Cast
  Exhaust Port Volume	115cc As Cast
  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, 97cc Maximum	.009' per cc
  Flat Mill, 102cc 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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