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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 PRO 1 CNC heads are professional quality competition cylinder heads. Dart applied the airflow technology developed in Their championship-winning Pro Stock engine program to produce these state-of-the-art heads. Every intake port, every exhaust runner, every valve bowl, and every combustion chamber is 100% CNC-machined on special dedicated PRO1 castings. Dart's five-axis computer-controlled machining centers produce compound curves and complex shapes that no human could duplicate with a hand grinder.
This head is not for every engine combination so if you're unsure whether this is the right Dart head for you, we always encourage you to contact us directly.
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, CNC-ported Dart 23-degree aluminum heads
· 66cc combustion chambers for 4.155+"-bore
· 227cc intake port
· Angle plugs
· Stainless steel valves 2.08 x 1.60"
· 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)
· 10-degree Titanium retainers std.
· New locks & seals
· 5/16" Guide plates
· Spring cups
· Extra thick deck surfaces to resist warpage
· 3/8" screw-in rocker arm studs (7/16" studs also available)
This is just a partial listing. We also offer heads from: Air Flow Research, Cylinder Head Innovations (CHI), CFE Racing Products, BMF Racing Heads, Dart, 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 in-house
installation, initial set-up, and tuning at Hardcore Horsepower, LLC!
TN residents add 9.25% sales tax.
No-interest
6 or 12-month Layaway plan available
Terms:
Minimum 20% down payment due at close of sale. The remaining balance due will
be divided into 6 or 12 equal payments. Each subsequent payment will be due at
the beginning of each month thereafter until balance is paid in full. Item will
be built and/or ordered and shipped after full payment has been received. All Deposits and Layaway payments are non-refundable,
except for approved product warranty purposes only. Feel free to contact us for
any more info or to get started.
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 227 CNC SBC 23° Aluminum Cylinder Head
Part# 11970040P (bare) & 11971143P (assembled)
Material: 355-T61 Alum alloy
Comb Chambers: 66cc for 4.155” bore
Intake Valve Dia: 2.08”
Intake Port volume: 227cc
Intake Port Dim: 2.200” x 1.310”
Int Port Location: Stock
Intake Gasket: Fel-Pro# 1206
Exh Valve Dia.: 1.600”
Exh Port volume: 85cc
Exhaust Port Dim: 1.410” x 1.585” w
Exh Port Location: Stock location & bolt pattern
Exhaust Gasket: Fel-Pro# 1405
Flow, Intake: 309cfm @ .700” lift / 28”
Flow, Exhaust: 226cfm @ .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. 63cc = .020” (.0065” = 1cc) Flat Mill
Angle mill .100” safely / .150” = 55cc (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: Titanium 10°
Spark Plug: Angle .750” reach, gasketed, Autolite AR3933
Spring Pockets: 1.550” OD (.030” deeper max)
Springs: Our Assembly: 1.550D = 195# @ 1.900” / .690” max Comp 954
Valve Length: 5.035” (+.100”)
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 = Mag-bronze (.002” press)
Valve Guide length: 2.100”
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 = 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
Weight: 23 lbs. | 
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