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QUALITY STRENGTH PERFORMANCE SINCE 1981<br />
QUICK INFO >>><br />
Fully CNC ported. Maximum performance/full<br />
competition, unlimited oval and super classes.<br />
7,000+ RPM, 400+ cubic inch engines.<br />
Completely CNC machined, the Iron Eagle<br />
23° 227cc CNC heads offer ultimate consistency<br />
and performance. With intake ports<br />
designed to optimize fuel/air flow efficiency<br />
and combustion chambers that offer a more<br />
complete and rapid burn, these heads are<br />
perfect for big inch small blocks.<br />
Standard valve angle and spacing are retained<br />
to allow use of off the shelf pistons<br />
and valve train components.<br />
Hardened exhaust seats are compatible<br />
with unleaded gasoline. Manganese Bronze<br />
valve guides extend cylinder head life.<br />
Heads are sold individually.<br />
23°<br />
227cc<br />
CNC<br />
IRON EAGLE 23° 227cc CNC (Angle Plug Heads)<br />
72cc COMBUSTION CHAMBERS<br />
PART NO. CONFIGURATION FOR USE MAX. LIFT<br />
10970040 Bare Head<br />
10971142 1.437” Dual Springs for Hydraulic Roller or Solid Flat Tappet Cam .620”<br />
10971143 1.550” Dual Springs for Solid Roller Cam .700”<br />
SMALL BLOCK CHEVY<br />
CAST IRON CYLINDER HEADS<br />
The consistency and accuracy of CNC (Computer<br />
Numerical Control) machining makes every CNC<br />
ported Dart head virtually identical. Our automated<br />
5-axis machining centers port heads with incredible<br />
accuracy - and you get the performance benefits at a<br />
very affordable price!<br />
Assemblies include Stainless Steel valves, premium<br />
springs, locks, retainers, guide plates and seals.<br />
Head parts kit - see page 118.<br />
Uses 7/16” screw-in<br />
rocker studs.<br />
Assemblies with 1.550” valve spring<br />
use +.100” long valves.<br />
RECOMMENDED MANIFOLD<br />
42411000 Single Plane<br />
42421000 Single Plane (4500)<br />
IRON EAGLE 23° 227cc CNC SPECS<br />
Material: High Nickel 220<br />
BHN Cast Iron<br />
Valve Angle:<br />
23° (stock)<br />
Intake Port Volume: 227cc CNC<br />
Intake Valve: 2.080”<br />
Exhaust Valve: 1.600”<br />
Chamber Volume: 72cc<br />
Plug Type:<br />
Angle<br />
FLOW DATA @ 28” WATER<br />
LIFT INTAKE EXHAUST<br />
.200” 158 123<br />
.300” 209 157<br />
.400” 257 187<br />
.500” 293 206<br />
.600” 302 221<br />
.700” 309 228<br />
.800” 324 235<br />
SHORT BLOCKS TOP KITS BLOCKS HEADS MANIFOLDS CRANKSHAFT ACCESS SBC LS BBC SBF HON COATINGS BILLET<br />
Not intended for sale or use with pollution controlled vehicles.<br />
248.362.1188 / DARTHEADS.COM Connect with us socially, search: DART MACHINERY<br />
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