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QUALITY STRENGTH PERFORMANCE SINCE 1981<br />
18°<br />
250–272cc<br />
CNC<br />
QUICK INFO >>><br />
Maximum competition, comp/modified drag racing,<br />
circle track. Over 7,000 RPM, high compression.<br />
By reducing the valve angle, reshaping the<br />
raised intake ports, and optimizing the combustion<br />
chambers, we produced a significant<br />
increase in both airflow and combustion<br />
efficiency - and that means more power!<br />
Dart delivers the features that put you ahead<br />
of the competition. We’ve refined the 18°<br />
design to give our customers more versatility,<br />
more performance, more reliability, and<br />
higher quality.<br />
Assemblies include Stainless Steel valves,<br />
premium springs, locks, retainers and seals.<br />
Titanium valves are an available option.<br />
Heads are sold individually. Head parts kit - see page 118.<br />
RACE SERIES 18° 250–272cc CNC - ALUMINUM<br />
PART NO. CONFIGURATION FOR USE MAX. LIFT<br />
14100000C Bare Head - No Porting<br />
FULL PORT CNC STD. - 250cc - 2.150"/1.600" VALVES<br />
PART NO. CONFIGURATION FOR USE MAX. LIFT<br />
14172010 Bare Head - Full Port<br />
14172111 1.550” Dual Springs for Solid Roller Cam .750”<br />
FULL PORT CNC STD. - 250cc - 2.180"/1.600" VALVES<br />
PART NO. CONFIGURATION FOR USE MAX. LIFT<br />
14172030 Bare Head - Full Port<br />
14172131 1.550” Dual Springs for Solid Roller Cam .750”<br />
FULL PORT CNC LG. - 272cc - 2.180"/1.600" VALVES<br />
PART NO. CONFIGURATION FOR USE MAX. LIFT<br />
14182030 Bare Head - Full Port<br />
14182131 1.550” Dual Springs for Solid Roller Cam .750”<br />
SMALL BLOCK CHEVY<br />
CAST ALUMINUM CYLINDER HEADS<br />
Requires shaft mount rockers<br />
and offset lifters.<br />
Requires special pistons.<br />
RECOMMENDED MANIFOLD<br />
42711000 Single Plane 4150<br />
RACE SERIES 18° 250-272cc CNC SPECS<br />
Material:<br />
RMR Cast<br />
Aluminum Alloy<br />
Valve Angle: 18°<br />
Intake Port Volume: 250-272cc CNC<br />
Intake Valve: 2.150”/2.180”<br />
Exhaust Valve: 1.600”<br />
Chamber Volume: 66cc w/SS<br />
Plug Type:<br />
Angle<br />
FLOW DATA @ 28” WATER<br />
LIFT INTAKE EXHAUST<br />
.200” 155 118<br />
.300” 225 169<br />
.400” 280 216<br />
.500” 323 242<br />
.600” 347 254<br />
.700” 361 258<br />
.800” 365 260<br />
Figures for Full CNC Port Lg.<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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