heres the heads I think your referring too
http://www.jegs.com/i/Dart/301/10511122P/10002/-1
$1242 plus shipping for a pair
Platinum 215 SBC 23° Iron Cylinder Head
Part# 10510020P thru 10620020P
Material: Superior iron alloy
Comb Chambers: 64cc & 72cc
Intake Valve Dia: 2.05â€
Intake Port volume: 215cc
Intake Port Dim: 2.210†x 1.210â€
Int Port Location: Stock
Intake Gasket: Fel-Pro# 1206
Exh Valve Dia.: 1.600â€
Exh Port volume: 84cc
Exhaust Port Dim: 1.380†x 1.420†w
Exh Port Location: Stock location & bolt pattern
Exhaust Gasket: Fel-Pro# 1404 or 1405
Flow, Intake: 268cfm @ .600†lift / 28â€
Flow, Exhaust: 175cfm @ .600†lift / 28â€
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 - 1.100â€x 2.000â€) 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 = 7.800â€)
Push rod Guide Plate: Must use Comp Cam # 4808 (flat)
Retainers: Steel (10°) / 1.250†( 7°)
Spark Plug: Angle or straight, .460†reach, tapered seat, Autolite AR133
Spring Pockets: 1.550†OD (.030†deeper max)
Springs: Our Assembly: 1.250S = 110# @ 1.700†/ .520†max Comp 981
1.437D = 130# @ 1.800†/ .620†max Comp 987
1.550D = 195# @ 1.900†/ .690†max Comp 954
Valve Length: Std 4.890†w/ 1.250 & 1.437 / 5.035†(+.100) w/ 1.550
Valve Stem Dia: .3415†- 11/32â€
Valve Train: Std SBC 3/8†or 7/16†stud mount
Valve Guides: .439†OD Int = Mag-bronze Exh = Phos-bronze (.002†press)
Valve Guide length: 1.950â€
Valve Guide clearance: .0014†- .002†(with our .3415 dia. 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 .350â€
Valve Seat angles: Int = 32° - 45° - 60° - 70°-80° Exh = 37° - 45° - radius
Stud Girdle: Use any standard girdle
Torque: Head Bolts = 70 ft/lb
Rocker Studs = 45 ft/lb
Manifold = 35 ft/lb
Block Use: Any SBC Iron or Aluminum
ID HAVE GONE THIS ROUTE
http://www.summitracing.com/parts/TFS-32400007/
$1,399.95
http://static.summitracing.com/global/i ... %20sbc.pdf
aluminum heads, that weigh less, flow better,
dart.......0.600' 268/175
trickflow 0.600" 282 /198
are less likely to get into detonation, and are much easier to repair for the price difference is a no brainer in my opinion