BB Chevrolet 286cc Aluminum Cylinder Heads. 2.25" intake, 1.88" exhaust. 112cc combustion chambers. Oval port design. These heads flow 331cfm/256cfm at .600"! Dyno tested! These heads produced a 50HP gain over the desired "049" Big Block castings - just a straight bolt on swap! Gains will be even higher on the more common factory heads! Manufactured from A356-T6 aluminum. Each pair comes complete with an assembly blueprint and detailed flow sheet. Set up for hydraulic roller applications up to .600" lift. Vacuum tested. Download Data here - DOWNLOAD Sold per pair, ready for installation.

• Head Gasket Mark IV Fel-Pro #1017-1 or equivalent
  Head Bolt Torque 75 ft/lbs.
  Head Bolts Mark IV ARP #135-3712
  Head Studs Mark IV ARP #235-4713
  Rocker Stud Torque 50 ft/lbs.
  Rocker Stud Girdle Harland Sharp G1114 or equivalent
  Rocker Arms Stud Mount Standard
  Intake Port (cc) 286cc
  Intake Port Dimensions 2.01" x 1.75" Oval
  Intake Gasket Fel-Pro #1210 or equivalent
  Exhaust Port (cc) 123cc
  Exhaust Port Location Raised .375"
  Exhaust Port Dimensions 1.75" x 2.00" D
  Exhaust Gasket PW #419 or equivalent
  Intake Valve Size 2.25"
  Exhaust Valve Size 1.88"
  Valve Angle 24°/15°
  Valve Spring Pocket O.D. 1.735"
  Valve Guide Size 11/32" .530" (Top) .570" (Base)
  Deck Thickness .750"
  Combustion Chamber (cc) 112cc
  Minimum Bore Diameter 4.25"
  Spark Plug Size 14mm x .750" Gasket (eg. Autolite #3924)
  Spark Plug Location/Angle OE/Straight

Intake Valves: PW 360025
Exhaust Valves: PW 360019
Valve Springs: Howards 98632-16
Spring Locators: Comp Cams 4776-16
Retainers: Comp Cams 741-16
Valve Locks: Comp Cams 630-16
Valve Seals: PW 360480
Rocker Studs: - PW 360372
Guide Plates: Manley 42164-8