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specs on the dart aluminum 230 CNC:
PRO 1
23 Degree 230cc SBC Head
Material: 355T6 Alum alloy
Comb Chambers: 64cc & 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# 1206
Exh Valve Dia.: 1.600� or 1.625�
Exh Port Volume: 75cc
Exhaust Port Dim: 1.375� x 1.325� w
Exh Port Location: Stock location & bolt pattern
Exhaust Gasket: Fel-Pro# 1405
Flow, Intake: 308cfm @ .700� lift / 28�
Flow, Exhaust: 207cfm @ .700� lift / 28�
Head Bolts: Stock bolts can be used. We recommend ARP# 134-3601
Head Studs: ARP# 134-4001 or 234-4301 (12pt)
Manifold: Alum Single Plane Dart (opening - 1.100�x 2.000�) 5.500� tall
Milling: Min. 58cc = .060� (.0065� = 1cc) Flat Mill
Angle mill .125� safely / .200� = 49cc 1.5º (carefully)
Pistons: Most 23º aftermarket pistons.
Push Rod Length: Stock thru +.100� Should always measure (Stock length = 7.800�)
Push rod Guide Plate: Must use Comp Cam # 4808 (flat)
Retainers: Steel 10º (+.050� lock & retainer)
Spark Plug: Angle or straight, .750� reach, gasketed, Champion C59C / C59YC
Spring Pockets: 1.550� OD (.030� deeper max)
Springs: Our Assembly:
1.437D = 130# @ 1.800� / .620� max Comp 987
1.550D = 195# @ 1.900� / .690� max Comp 954
Stud Girdle: Use any standard girdle
Valve Length: 5.015� (+.100�) (std 4.890� w/1.437)
Valve Stem Dia: .3415� - 11/32�
Valve Train: Std SBC 3/8� or 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 our .3415 dia. 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: Int = 32º - 45º - 60º - 70º Exh = 37º - 45º - radius
Torque: Head Bolts = 70 ft/lb; Rocker Studs = 45 ft/lb; Manifold = 35 ft/lb
Block Use: Any SBC Iron or Aluminum
Weight: 23 lbs
i like. my only question is which is better, straight or angled spark plug bungs?
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JSFBOA
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