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QUALITY STRENGTH PERFORMANCE SINCE 1981<br />
Dart PRO1 Platinum series heads for LT1/<br />
LT4 small blocks were developed with<br />
Dart’s exclusive wet flow technology. Their<br />
advanced features include 5-angle intake<br />
seats and back cut valves that provide shear<br />
points for the fuel to go into suspension as it<br />
enters the combustion chamber.<br />
The spark plugs are located as close to the<br />
top and center of the combustion chambers<br />
as possible, shortening the distance that<br />
the flame front must travel and producing a<br />
more uniform pressure rise in the cylinder.<br />
Assemblies include Stainless Steel valves,<br />
premium springs, locks, retainers, guide<br />
plates and seals.<br />
Heads are sold individually.<br />
23°<br />
LT1/LT4<br />
QUICK INFO >>><br />
Designed for 1992-1997 LT1 and LT4 small block<br />
Chevy engines. 180cc, 200cc and 215cc intake<br />
runner sizes cover street performance to serious<br />
competition. Gen II reverse flow cooling system<br />
and intake manifold flange.<br />
PRO1 23° 180cc - ALUMINUM (LT1/LT4 Heads)<br />
58cc COMBUSTION CHAMBERS<br />
PART NO. CONFIGURATION FOR USE MAX. LIFT<br />
11110010L Bare Head<br />
11111111L 1.250” Single Springs for Hydraulic Flat Tappet Cam .510”<br />
11111112L 1.437” Dual Springs for Hydraulic Roller or Solid Flat Tappet Cam .620”<br />
PRO1 23° 200cc - ALUMINUM (LT1/LT4 Heads)<br />
58cc COMBUSTION CHAMBERS<br />
PART NO. CONFIGURATION FOR USE MAX. LIFT<br />
11310010L Bare Head<br />
11311111L 1.250” Single Springs for Hydraulic Flat Tappet Cam .510”<br />
11311112L 1.437” Dual Springs for Hydraulic Roller or Solid Flat Tappet Cam .620”<br />
11311113L 1.550” Dual Springs for Solid Roller Cam .700”<br />
PRO1 23° 215cc - ALUMINUM (LT1/LT4 Heads)<br />
58cc COMBUSTION CHAMBERS<br />
PART NO. CONFIGURATION FOR USE MAX. LIFT<br />
11510020L Bare Head<br />
11511122L 1.437” Dual Springs for Hydraulic Roller or Solid Flat Tappet Cam .620”<br />
11511123L 1.550” Dual Springs for Solid Roller Cam .700”<br />
SMALL BLOCK CHEVY GEN II<br />
CAST ALUMINUM CYLINDER HEADS<br />
Head parts kit - see page 118.<br />
Uses 3/8” screw-in rocker studs.<br />
7/16” upgrade available.<br />
Assemblies with 1.550” valve spring<br />
use +.100” long valves.<br />
PRO1 23° LT1/LT4 SPECS<br />
Material:<br />
RMR Cast<br />
Aluminum Alloy<br />
Valve Angle: 23° (stock)<br />
Intake Port Volume: 180/200/215cc<br />
Intake Valve: 2.020”/2.050”<br />
Exhaust Valve: 1.600”<br />
Chamber Volume: 58cc<br />
PRO1 180cc FLOW @ 28” WATER<br />
LIFT INTAKE EXHAUST<br />
.200” 139 114<br />
.300” 193 145<br />
.400” 231 164<br />
.500” 249 172<br />
.600” 253 174<br />
PRO1 200cc FLOW @ 28” WATER<br />
LIFT INTAKE EXHAUST<br />
.200” 129 114<br />
.300” 185 145<br />
.400” 229 164<br />
.500” 261 172<br />
.600” 263 174<br />
PRO1 215cc FLOW @ 28” WATER<br />
LIFT INTAKE EXHAUST<br />
.200” 127 114<br />
.300” 178 145<br />
.400” 216 164<br />
.500” 249 172<br />
.600” 268 174<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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