You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
QUALITY STRENGTH PERFORMANCE SINCE 1981<br />
QUICK INFO >>><br />
Excellent street, strip, oval track and truck or marine<br />
performance upgrade. Maximum torque and throttle<br />
response from idle to 6,000 RPM. Best for 302-351<br />
cubic inch engines. Works with most standard components.<br />
Small block Ford PRO1 20° 170cc Aluminum cylinder<br />
heads feature high flowing as cast ports<br />
with profiled valve guide bosses and are bowl<br />
blended on 5-axis CNC machining centers.<br />
Standard valve angle and spacing is retained<br />
for bolt on compatibility. Exhaust runners are<br />
raised .135” for improved flow. Manganese<br />
Bronze valve guides are used for long life, and<br />
hardened valve seats provide durability with<br />
unleaded fuels.<br />
Assemblies include Stainless Steel valves,<br />
premium springs, locks, retainers, studs, guide<br />
plates and seals.<br />
Heads are sold individually.<br />
PRO1 20° 170cc - ALUMINUM<br />
20°<br />
170cc<br />
SMALL BLOCK FORD<br />
CAST ALUMINUM CYLINDER HEADS<br />
58cc COMBUSTION CHAMBERS<br />
PART NO. CONFIGURATION FOR USE MAX. LIFT<br />
13100080 Bare Head<br />
13101181 1.250” Single Springs for Hydraulic Flat Tappet Cam .510”<br />
13101182 1.437” Dual Springs for Hydraulic Roller or Solid Flat Tappet Cam .620”<br />
62cc COMBUSTION CHAMBERS<br />
PART NO. CONFIGURATION FOR USE MAX. LIFT<br />
13110080 Bare Head<br />
13111181 1.250” Single Springs for Hydraulic Flat Tappet Cam .510”<br />
13111182 1.437” Dual Springs for Hydraulic Roller or Solid Flat Tappet Cam .620”<br />
Head parts kit - see page 118.<br />
Uses 3/8” screw-in rocker studs.<br />
7/16” upgrade available.<br />
PRO1 20° 170cc SPECS<br />
Material:<br />
RMR Cast<br />
Aluminum Alloy<br />
Valve Angle: 20° (stock)<br />
Intake Port Volume: 170cc<br />
Intake Valve: 1.940”<br />
Exhaust Valve: 1.600”<br />
Chamber Volume: 58 or 62cc<br />
FLOW DATA @ 28” WATER<br />
LIFT INTAKE EXHAUST<br />
.200” 137 112<br />
.300” 200 151<br />
.400” 240 171<br />
.500” 251 173<br />
.600” 261 172<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 />
107
Change language