SB Chevrolet 185cc Aluminum Cylinder Heads. Fits 4.00" and larger bore. 2.02" intake, 1.60" exhaust. 73cc combustion chambers. Manufactured from A356-T6 aluminum, they feature bronze guides and straight plug design. 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. Download Data here - DOWNLOAD Sold as pairs.

• 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) 185cc
  Intake Port Dimensions 2.00" x 1.20"
  Intake Gasket Fel-Pro #1204 or equivalent
  Exhaust Port (cc) 71cc
  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) 73cc
  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