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WE DO NOT STOCK THIS ITEM.
IT WILL SHIP DIRECTLY FROM THE MANUFACTURER TO YOU WITHIN A FEW DAYS AFTER YOUR PURCHASE. THANK YOU.
Dart's small-block Chevy Pro1 heads have been given the full Platinum treatment utilizing wet-flow technology. Independent tests have demonstrated a typical 25 horsepower gain over the previous Dart Pro1 design. The redesigned chamber features improved fuel distribution, spark plugs are located high and as close to the center of the chamber as possible and five-angle intake seats shear the liquid fuel and air as it enters the chamber.
The intake face, exhaust face, and exhaust ports have also been redesigned. Valve guide bosses are profiled and casting walls are cleaner and more consistent, resulting in greater control over flow, heat, and combustion. The 230cc intake runner size was chosen to suit hot street, hot off-road, and competition engines from 383-434+ci. You can choose either 64 or 72cc combustion chambers to perfect your compression ratio. Dart Pro 1 Platinum heads can be used with off-the-shelf pistons, valvetrain components, and intake manifolds, making them an ideal choice.
These
cylinder heads will be assembled and shipped direct from Dart in
Michigan, USA. We do not stock these heads, nor do we modify them in any
way, unless specifically-requested. All components used in the heads
are supplied by Dart.
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Fully-Assembled, complete pair of cylinder heads including:
· 1 pair assembled Dart Pro 1 Platinum 23-degree aluminum heads PN 11711143P
· 64cc combustion chambers (72cc also available)
· 230cc intake port
· Angle plugs (straight plugs also available)
· Stainless steel valves 2.08 x 1.60"
· 5-angle valve job
· Valve springs for solid roller cams std. 1.550"
O.D. springs (220# @ 1.900"; 540# @ 1.250"; 483# Rate, 1.180" CB,
.650"/.660" max lift) (Hydraulic roller valve springs also available)
· Chrome moly retainers (Ti retainers also available)
· New locks & seals
· 5/16" Guideplates
· Steel spring cups
· Extra thick deck surfaces to resist warpage
· 3/8" screw-in rocker arm studs (7/16" studs also available) - Flow, Intake: 308cfm @ .700” lift / 28”
- Flow, Exhaust: 207cfm @ .700” lift / 28”
*Note: CNC porting is extra
This is just a partial listing. We also offer heads from: Air Flow Research (AFR), Cylinder Head Innovations (CHI), CFE Racing Products, BMF Racing Heads, Edelbrock, Brodix, GM Performance Parts, RHS Pro Action, and more to work on all engines. Any head combo including 23, 18, 15, 14, 13, and 11-degree valve angles can be custom-tailored to fit your needs. From mild-to-wild, we can put together a package to make your ride scream!
We install and tune! Purchase this item and receive professional in-house
installation, initial set-up, and tuning at Hardcore Horsepower, LLC!
TN residents add 9.25% sales tax. Engines may
take approximately 4-12+ weeks to build. Final payment due in full immediately
upon purchase, excluding engines purchased on Layaway plan.
Details of full build and copies of all pertinent engine information will be
provided to buyer only. This item will include all parts listed above, except
where noted. Some products shown in photos may not be included. Any/all
products may be changed without notice.
Hardcore Horsepower,
LLC Warranty:
All products used in Hardcore Horsepower engines are protected against defects
in workmanship and materials by their original manufacturer’s warranties. See
Hardcore Horsepower Store for more warranty details.
We offer Ground shipping to the 48 states. AK, HI, and P.R.
shipping extra.
Feel free to call for more info or to customize your kit
accordingly.
International Shipping may be available
for extra cost. Please provide a shipping address for quote.
Photos shown are
representational only.
Actual item may
differ.
Hardcore Horsepower, LLC
Franklin, TN
615/595-0060
10am-6pm Monday thru Friday
USA Central Time
Check out all of the other
great deals available in our eBay Store!!!
We Make It Go Fast!!!
9/19/2007
Dart Platinum 230 SBC 23° Aluminum Cylinder Head
Part# 11710040P thru 11820040P
Material: 355T6 Alum alloy
Comb Chambers: 64cc & 72cc
Intake Valve Dia: 2.08”
Intake Port volume: 230cc
Intake Port Dim: 2.225” x 1.245”
Int Port Location: Stock
Intake Gasket: Fel-Pro# 1206
Exh Valve Dia.: 1.600”
Exh Port volume: 75cc
Exhaust Port Dim: 1.370” x 1.430” 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 1.5° (carefully)
Pistons: Most 23°aftermarket pistons.
Push Rod length: Stock thru +.100” Should always measure (Stock length = 7.800”)
Push rod Guide Plate: Dart guide plate 27001110
Retainers: Steel 10° (+.050” lock & retainer)
Spark Plug: Angle or straight, .750” reach, gasketed, Autolite AR3933
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
Valve Length: 5.035” (+.100”) (std 4.935” 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: 2.100”
Valve Guide clearance: .0014” - .002” (with our .3415 dia. valve stem)
Valve Guide Spacing: 1.890” exhaust moved .030” from intake
Valve Seats: Powder metal, .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 = 32° - 45° - 60° - 70°-80° Exh = 37° - 45° - radius
Stud Girdle: Retains standard SBC stud location. Recommended Dart PN # 64110002
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 each
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