Specifications

Material: 355 T-6 Aluminum Alloy
Combustion Chambers: 64cc
Intake Valve Dia.: 2.05''
Intake Port Volume: 215cc
Intake Port Dia.: 2.150'' x 1.190''
Intake Port Location: Stock
Intake Gasket: Fel-Pro 375-1206
Exhaust Valve Dia.: 1.600''
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
Intake Flow: 276 cfm @ .600'' lift / 28''
Exhaust Flow: 180 cfm @ .600'' lift / 28''
Head Bolts: ARP 070-134-3601
Head Studs: ARP 070-134-4001 or 070-234-4301
Manifold:Aluminum Singl Plane Dart (opening - 1.100" x 2.00") 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:Straight, .750'' reach, gasket-seat
Spring Pockets: 1.550'' OD (.030'' deeper max)
Springs: 1.437''
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'' or 7/16" Stud Mount
Valve Guides: 1/2'' OD Int = Mag-bronze, Exh = Mag-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