Material: Cast Iron
Comb Chambers: 76cc
Intake Valve Dia: 1.940"
Intake Port volume: 165cc
Intake Port Dim: 1.100" W x 1.925" H
Int Port Location: Stock
Exh Valve Dia.: 1.500"
Exh Port volume: 65cc
Exhaust Port Dim: 1.340" W x 1.300" H
Exh Port Location: Stock location & bolt pattern
Flow, Intake: 210 cfm @ .500" lift / 28"
Flow, Exhaust: 138 cfm @ .500" lift / 28"
Milling: Min. 62cc = .060" (.0065" = 1cc) Flat Mill
Pistons: Most 23° aftermarket pistons.
Push Rod length: Stock (Stock length = 7.800") * Must measure *
Push Rod Guide: Stock type, integral
Retainers: Steel 1.250" = (7° )
Rocker Arm stud: Use screw-in stud w/integral nut
Spark Plug: Straight, .460" reach, tapered seat
Spring Cups: N/A, Use hardened shim or locator
Spring Pockets: Cut for 1.250" OD (.030" deeper max)
Valve Angles: 23°
Valve Length: STD = 4.890"
Valve Stem Dia: .3415" - 11/32"
Valve Guides: Integral cast into head
Valve Guide clearance: .002" - .0025" (with .3415 dia. valve stem)
Valve Guide Spacing: 1.890" moved .030" from stock
Valve Seals: Cut for umbrella seals
Valve Seats: Exh = Powdered Metal, .006" press
Valve Seat dim: Exh - 1.650" x 1.280" x .350"
Valve Seat angles:
- Int = 32° - 45° - 60° - 70°- 80°
- Exh = 37° - 45° - radius
Torque Specs:
- Head Bolts = 70 ft/lb (w/ oil)
- Rocker Studs = 55 ft/lb
- Manifold = 35 ft/lb
Block Use: Any SBC, Iron or Aluminum
Weight: 58 lbs Assembled
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