Material: 355 T-6 Aluminum Alloy
Combustion Chambers: 64cc
Intake Valve Dia.: 2.08'
Intake Port Volume: 230cc
Intake Port Dia.: 2.180' x 1.210'
Intake Port Location: Stock
Intake Gasket: Fel-Pro 375-1206
Exhaust Valve Dia.: 1.60'
Exhaust Port Volume: 75cc
Exhaust Port Dim.: 1.375' x 1.325'
Exhaust Port Location: Stock Location & bolt pattern
Exhaust Gasket: Fel-Pro 375-1404 or 375-1405
Intake Flow: 308 cfm @ .700' lift / 28'
Exhaust Flow: 207 cfm @ .700' lift / 28'
Head Bolts: ARP 070-134-3601
Head Studs: ARP 070-134-4001 or 070-234-4301
Manifold: Aluminum Single Plane Manifold (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
Pushrod Length: Stock thru +.100', Should always measure (stock length = 7.800')
Pushrod Guide Plate: Comp Cams 249-4808-8
Retainers: Steel 10° / 1.250' (7°)
Spark Plug: Angle Plugs, .750' reach, gasket-seat
Spring Pockets: 1.550' OD (.030' deeper max)
Springs (Not Included on Bare Heads): 1.250' = 110lb @ 1.700' / .520' Comp 249-981-16; 1.437' = 130lb @ 1.800' / .620' max Comp Cams 249-987-16; 1.550' = 195lb @ 1.900' / .690' max, Comp Cams 249-954-16
Stud Girdle: Use any stud girdle
Valve Length: Standard 4.890' w/1.250' & 1.437' (+.100) w/1.550'
Valve Stem Dia.: 11/32'
Valve Train: Standard SB-Chevy 3/8' 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: Hardened ductile iron, .006' press
Valve Seat Dim: Int - 2.160' x 1.810' x .350', Exh - 1.650' x 1.350' x .350'
Valve Seat Angles: 32° - 45° - 60° - 70°, Exh - 37° - 45° - radius
Torque: Head bolts = 70ft/lb; Rocker studs = 45ft/lb; Manifold = 35ft/lb
Block: Any SB-Chevy iron or aluminum
Weight: 23lbs