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QUALITY STRENGTH PERFORMANCE SINCE 1981<br />
QUICK INFO >>><br />
Recommended for engines with 4.000” bore or<br />
larger. Maximum competition, competition modified<br />
drag racing, circle track. Over 7,000 RPM.<br />
Dart's PRO1 LS 15° 250cc CNC ported Aluminum<br />
cathedral port cylinder heads for GM<br />
LS series small block V8 engines take performance<br />
to the next level.<br />
This LS CNC cathedral port head is machined<br />
on a dedicated casting with extra thick sections<br />
to maintain the proper wall thickness<br />
after porting. Due to the large diameter intake<br />
valves, the Dart LS CNC head is recommended<br />
for use on engines with 4.000 inch<br />
and larger cylinder bores. Precise computer<br />
controlled CNC machining, multi-angle intake<br />
seats, and radiused exhaust seats enhance<br />
airflow. Extra material above the ports<br />
accommodates valve train upgrades.<br />
Heads are sold individually.<br />
15°<br />
250cc<br />
LS - CNC<br />
PRO1 LS 15° 250cc CNC - ALUMINUM - LS1 COMPATIBLE (CATHEDRAL PORT)<br />
PART NO. CONFIGURATION FOR USE VALVES MAX. LIFT<br />
11071040 Bare Head 2.080"/1.600" VJ<br />
11071142 1.290” Beehive Springs for Hydraulic Roller 2.080"/1.600" .625”<br />
11071143 1.295” Dual Springs for Hydraulic Roller 2.080"/1.600" .650”<br />
GEN III - CATHEDRAL PORT<br />
CAST ALUMINUM 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 />
Head parts kit - see page 118.<br />
PRO1 LS 15° 250cc CNC SPECS<br />
Material:<br />
RMR Cast<br />
Aluminum Alloy<br />
Valve Angle: 15° (stock)<br />
Intake Port Volume: 250cc CNC<br />
Intake Valve: 2.080”<br />
Exhaust Valve: 1.600”<br />
Chamber Volume: 68cc<br />
FLOW DATA @ 28” WATER<br />
LIFT INTAKE EXHAUST<br />
.200” 144 114<br />
.300” 214 157<br />
.400” 264 192<br />
.500” 305 219<br />
.600” 344 240<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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