For When You Need Iron Heads 215cc - 398cfm    230cc - 338cfm     200cc Straight or Angle Plugs Combustion Chambers: 64cc or 72cc Intake Valve Dia.: 2.02'' Intake Port Volume: 200cc Intake Port Dim.: 2.000'' x 1.190'' Int Port Location: Stock Intake Gasket: Fel-Pro 375-1205 Exhaust Valve Dia.: 1.60'' Exh Port Volume: 75cc Exh Port Dim: 1.375'' x 1.325'' Exh Port Location: Stock Location and Bolt Pattern Exhaust Gasket: Fel-Pro 375-1404 or 1405 Flow, Intake: 288cfm @ .500'' Lift Flow, Exhaust: 192cfm @ .500'' Lift   __________________________________________________________   215cc Straight or Angle Plugs Combustion Chambers: 64cc or 72cc Intake Valve Dia.: 2.05'' Intake Port Volume: 215cc Intake Port Dim.: 2.150'' x 1.190'' Int Port Location: Stock Intake Gasket: Fel-Pro 375-1206 Exhaust Valve Dia.: 1.60'' Exh Port Volume: 75cc Exh Port Dim: 1.375'' x 1.325'' Exh Port Location: Stock Location and Bolt Pattern Exhaust Gasket: Fel-Pro 375-1404 or 1405 Flow, Intake: 295cfm @ .600'' Lift Flow, Exhaust: 211cfm @ .600'' Lift _______________________________________________________________________   230cc Straight or Angle Plugs Combustion Chambers: 64cc or 72cc Intake Valve Dia.: 2.08'' Intake Port Volume: 230cc Intake Port Dim.: 2.180'' x 1.210'' Int Port Location: Stock Intake Gasket: Fel-Pro 375-1206 Exhaust Valve Dia.: 1.60'' Exh Port Volume: 75cc Exh Port Dim: 1.375'' x 1.325'' Exh Port Location: Stock Location and Bolt Pattern Exhaust Gasket: Fel-Pro 375-1404 or 1405 Flow, Intake: 338cfm @ .700'' Lift Flow, Exhaust: 227cfm @ .700'' Lift Head Bolts: ARP 070-134-3601 Head Studs: ARP 070-134-4001 or 234-4301 (12pt) Manifold: Aluminum Single Plane (opening - 1.100'' x 2.000'') 5.500'' Tall Milling: Min. 58cc = .060'' (.0065'' = 1cc) Flat Mill, Angle Mill .125'' safely / .200'' = 49cc 1.5° (carefully) Pistons: Most 23° aftermarket pistons Push Rod Length: Stock thru +.100'' should always measure (Stock Length = 7.800'') Push Rod Guide Plate: Must use Comp Cam 249-4808 (Flat) Retainers: Steel 7° Spark Plug: Straight, .460'' reach, tapered seat, Champion V59C/V59YC Spark Plug: Angle, .460'' reach, tapered seat, Champion V59C/V59YC\ Spring Pockets: 1.550'' OD (.030'' deeper max) Springs: 1.250'' Single Spring, 140lbs seat pressure @ 1.700'' installed height / .510'' max lift, Comp Cams 249-981 Stud Girdle: Use any standard girdle Valve Length: Standard 4.890'' w/1.250'' Spring Valve Stem Dia.: 11/32'' Valve Train: Standard SBC 3/8'' (or can be changed to 7/16'') stud mount Valve Guides: 1/2'' OD Int = Mag-bronze, Exh = Phos-bronze (.002'' press) Valve Guide Length: 1.950'' Valve Guide Clearance: .0014'' - .002'' (with 11/32'' valve stem) Valve Guide Spacing: 1.890'' moved .030'' from stock Valve Seats: Exh = Hardened Ductile Iron, .006'' press Valve Seat Dim: Exh = 1.650'' x 1.350'' x .350'' Valve Seat Angles: Int = 32° - 45° - 60° - 70°, Exh = 37° - 45° - radius Torque: Head Bolts = 70ft/lbs; Rocker Studs = 45ft/lbs; Manifold = 35ft/lbs Block Use: Any SBC Iron or Aluminum Weight: 52lbs