SB Chevrolet 204cc Aluminum Cylinder Heads. Fits 4.00" and larger bore. 2.02" intake, 1.60" exhaust. 67cc combustion chambers. Manufactured from A356-T6 aluminum, they feature bronze guides, straight plug design and can accept center bolt or perimeter bolt valve covers. Assembled with 1.25" OD springs for hydraulic flat tappet (non-roller) cams up to .525" lift. Each pair comes assembled with a detailed flow sheet and assembly blueprint. Vacuum tested. Sold as pairs. Note: PW 200 Heads have an intake port opening of 1.31”x2.22”. Many early small port intake manifolds will not work with these heads. Check your intake manifold port size before ordering. Download Data here - DOWNLOAD

• Head Gasket Fel-Pro #1003 or equivalent
  Head Bolt Torque 70 ft/lbs.
  Head Bolts ARP #134-3601 or equivalent
  Head Studs ARP #134-4001 or equivalent
  Rocker Stud Torque 40-45 ft/lbs.
  Rocker Stud Girdle OE Stock Configuration
  Rocker Arms Stud Mount Standard
  Intake Port (cc) 204cc
  Intake Port Dimensions 2.22" x 1.31"
  Intake Gasket Fel-Pro #1206 or equivalent
  Exhaust Port (cc) 70cc
  Exhaust Port Location Stock
  Exhaust Port Dimensions 1.34" x 1.39" (D)
  Exhaust Gasket PW #412 or equivalent
  Intake Valve Size 2.02"
  Exhaust Valve Size 1.60"
  Valve Angle 23°
  Valve Spring Pocket O.D. 1.56"
  Valve Guide Size 11/32" .530" (Top) .570" (Base)
  Deck Thickness .625"
  Combustion Chamber (cc) 67cc
  Spark Plug Size 14mm x .750" Gasket (eg. Autolite #3924)
  Spark Plug Location/Angle OE/Straight

Intake Valves: PW 360020 (2.02" x 4.91")
Exhaust Valves: PW 360016 (1.60" x 4.93")
Valve Springs: PEP 053-574-700 (125#@1.75" 347#@1.20" 1.10"CB)
Valve Spring Cups: PW 360112
Valve Spring Retainers: Manley 23651-16
Valve Locks: PW 360410 (11/32" x 7 degree)
Valve Seals: PW 360480 (11/32"x.530")
Rocker Studs: PW 360338 (3/8" x 7/16")
Pushrod Guide Plates: PW 360200