SB Chevrolet Pro-Series PRO210 212cc Aluminum Cylinder Heads. Fits 4.00" and larger bore. 2.08" intake, 1.60" exhaust, 66cc combustion chambers. 8mm guides, .100" raised exhaust ports, 3/4" thick deck. Springs for use with hydraulic roller cams up to .625" lift. Designed for ULTIMATE flow. Manufactured from A356-T6 aluminum. Each head comes with a detailed flow sheet. Ready for installation and sold as pairs. Adjustable guide plates required (sold separately). Download Data here - DOWNLOAD NOTE: Requires offset intake rocker arms if using 3/8" pushrods..

• Head Gasket Fel-Pro #1003 or equivalent
  Head Bolt Torque Per Head Bolt Manufacturer
  Head Bolts ARP #134-3601/#134-3701
  Head Studs ARP #134-4001/#234-4301
  Rocker Stud Torque 55 ft/lbs.
  Rocker Stud Girdle AFR #6200
  Rocker Arms Stud Mount Standard (Must use 5/16" pushrods)
  Intake Port (cc) 212cc
  Intake Port Dimensions 2.21" x 1.30"
  Intake Gasket Fel-Pro #1206 or equivalent
  Exhaust Port (cc) 72cc
  Exhaust Port Location Raised .250"
  Exhaust Port Dimensions 1.42" x 1.53"
  Exhaust Gasket Fel-Pro #1405 or equivalent
  Intake Valve Size 2.08"
  Exhaust Valve Size 1.60"
  Valve Angle 23°
  Valve Spring Pocket O.D. 1.56"
  Valve Guide Size 8mm .502" (Top) .560" (Base)
  Deck Thickness .750"
  Combustion Chamber (cc) 66cc
  Spark Plug Size 14mm x .750" Gasket (eg. Autolite #3923)
  Spark Plug Location/Angle Aftermarket/Angle

Intake Valves: PW 360042 (2.08")
Exhaust Valves: PW 360047 (1.60")
Valve Springs: Howards Cams 98445-16
Valve Spring Locators: Comp Cams 4776-16
Valve Spring Retainers: Manley 23635-16
Valve Locks: Comp Cams 632-16 (8mm x 10 degree)
Valve Seals: PW 360488 (8mm)
Rocker Studs: PW 360376 (7/16")
Pushrod Guide Plates: Not Included (Comp Cams Adjustable 4835-8)