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<p align="center"><b><font class="Helvetica24" face="Arial, Helvetica, adobe-helvetica, Arial Narrow" color="#FFFFFF" size="5">The
Ford
Ranger 4.0L OHV & SOHC V6</font></b></td>
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</table>
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</div>
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<table border="0" width="98%" bgcolor="#FFFFFF">
<tr>
<td width="100%" bgcolor="#FFFFFF">
<div align="center">
<p align="center" style="margin-left: 5; margin-right: 5"><img border="0" src="images/40_engine.jpg" width="400" height="300"></div>
<div align="center">
<p align="left" style="margin-left: 10; margin-right: 10"><font size="3" face="Arial">The
4.0L OHV (Over Head Valve) V-6 engine found its way in to the Ford
Ranger in 1990 and ultimately replaced the 2.9L V-6. This
evolutionary redesign of the American 2.9L solved many of the
reliability issues that plagued its predecessor. A beefier cylinder head
design eliminated the 2.9L's common failure of cracked heads. Hydraulic
roller lifters replaced the simple hydraulic lifters used in the 2.9L,
which were sometimes overly sensitive to oil contamination, often
requiring the lifters to be replaced prematurely. However, one major
design fault was not completely eliminated: Valve rockers and upper
pushrod tips still received poor oil supply, resulting in eventual wear
to these areas, and consequential valvetrain noise as a result of the
increased clearance. Required replacement of these parts is common in
older engines.</font></div>
<div align="center">
<p align="left" style="margin-left: 10; margin-right: 10"><font size="3" face="Arial">The
4.0L OHV engine was produced
until 2000 and was used in the Ford Explorer and Ranger. Output was 160hp
and 225 ft·lbf. Though there is some variation, typically 155hp
is quoted as horsepower for 1990-1992 applications.</font></div>
<div align="center">
<p align="left" style="margin-left: 10; margin-right: 10"><font size="3" face="Arial">In
1998 the 4.0L SOHC (Single Over Head Cam) engine replaced the 4.0L OHV
engine producing 207hp.</font></div>
<div align="center">
<p align="left" style="margin-left: 10; margin-right: 10"><font size="3" face="Arial"><b>SOHC
& OHV Engine Differences:</b></font></div>
<div align="center">
<p align="left" style="margin-left: 20; margin-right: 10"><font size="3" face="Arial">The
difference between a SOHC 4.0L and OHV 4.0L is that in a SOHC engine
there is a camshaft sitting on the top of each cylinder head with the
valves running directly off the camshaft. It doesn't rely on push rods,
rocker arms, or lifters. The SOHC engine uses a jackshaft in place of a
camshaft to drive a timing chain to each cylinder head. Three timing
chains are used, one from the crank to the jackshaft, one in the front
of the engine to drive the cam for the left bank, and one on the back of
the engine to drive the cam for the right bank.</font></div>
<div align="center">
<p align="left" style="margin-left: 20; margin-right: 10"><font size="3" face="Arial">The
OHV engine has the cam mounted above the crank. The cam and crank are
joined in time by a timing chain. Lifters ride on the cam and push rods
that extend to rocker arms in the heads which push the valves.</font></div>
<div align="center">
<p align="left" style="margin-left: 5; margin-right: 5"> </div>
<div align="center">
<table border="1" cellpadding="2" cellspacing="0" width="95%" bordercolor="#000000">
<tr>
<td width="100%" colspan="2" bgcolor="#000000">
<p align="center"><font size="4" face="Arial" color="#FFFFFF"><b>Specifications</b></font></td>
</tr>
<tr>
<td width="50%"><font size="3" face="Arial Narrow">Engine
Displacement (Cubic Inches)</font></td>
<td width="50%"><font size="3" face="Arial Narrow">245 CID</font></td>
</tr>
<tr>
<td width="50%"><font size="3" face="Arial Narrow">Type</font></td>
<td width="50%">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><font size="3" face="Arial Narrow">OHV (1990 - 2000) (VIN
Code X)</font></td>
</tr>
<tr>
<td><font size="3" face="Arial Narrow">SOHC (2001 - 2007) (VIN
Code E)</font></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="50%"><font size="3" face="Arial Narrow">Bore x Stroke</font></td>
<td width="50%"><font size="3" face="Arial Narrow">3.95 x 3.31
inches</font></td>
</tr>
<tr>
<td width="50%"><font size="3" face="Arial Narrow">Compression Ratio</font></td>
<td width="50%"><font size="3" face="Arial Narrow">9.0:1</font></td>
</tr>
<tr>
<td width="50%"><font size="3" face="Arial Narrow">Fuel System</font></td>
<td width="50%"><font size="3" face="Arial Narrow">Sequential Fuel
Injection</font></td>
</tr>
<tr>
<td width="50%"><font size="3" face="Arial Narrow">Fuel Pressure</font></td>
<td width="50%">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><font size="3" face="Arial Narrow">39 - 40 PSI (30 PSI
@ idle) (OHV Engines)</font></td>
</tr>
<tr>
<td><font size="3" face="Arial Narrow">64 - 75 PSI (SOHC
Engines)</font></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="50%"><font size="3" face="Arial Narrow">Horsepower</font></td>
<td width="50%">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><font size="3" face="Arial Narrow">160hp @ 4200 RPM (1990
- 2000)</font></td>
</tr>
<tr>
<td><font size="3" face="Arial Narrow">207hp @ 5250 RPM (2001
- 2007) </font></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="50%"><font size="3" face="Arial Narrow">Torque</font></td>
<td width="50%">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><font size="3" face="Arial Narrow">220 @ 2400 RPM (1990 -
2000)</font></td>
</tr>
<tr>
<td><font size="3" face="Arial Narrow">238 @ 3000 RPM (2001 -
2007)</font></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="50%"><font size="3" face="Arial Narrow">Oil Pressure</font></td>
<td width="50%"><font size="3" face="Arial Narrow">40 - 60 PSI @
2000 RPM</font></td>
</tr>
<tr>
<td width="100%" colspan="2" bgcolor="#808080">
<p align="center"><b><font size="4" face="Arial" color="#FFFFFF">Tune
Up</font></b></td>
</tr>
<tr>
<td width="50%" valign="top" align="left"><font size="3" face="Arial Narrow">Spark Plug
(Motorcraft)</font>
<p><font size="3" face="Arial Narrow"><b>Important Note:</b> The
SOHC spark plug is about 1/4 inch longer then that of the OHV. The
OHV plug will fit but it won't operate properly.</font></p>
<p align="center"><img border="0" src="images/spark_plug_comparo.JPG" width="398" height="170"></p>
<p align="center"><font face="Arial Narrow" size="3">(OHV spark
plug at the top - SOHC plug on the bottom)<br>
</font></p>
</td>
<td width="50%" valign="top" align="left">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><font size="3" face="Arial Narrow">1990-1996 uses SP486
(Platinum) (old part number is AWSF42P)</font></td>
</tr>
<tr>
<td><font size="3" face="Arial Narrow">1997-2000 uses SP500
(Platinum) (old part number is AGSF22PP) or </font><font size="3" face="Arial Narrow">SP413
(Premium Nickel)</font></td>
</tr>
<tr>
<td><font size="3" face="Arial Narrow">2001-2005 uses SP498 (Platinum)
(old part number is </font><font size="3" face="Arial Narrow">AGSF34FP)</font><font size="3" face="Arial Narrow">
or SP412 (Nickel) </font></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="50%"><font size="3" face="Arial Narrow">Spark Plug Gap</font></td>
<td width="50%"><font size="3" face="Arial Narrow">0.054 inches</font></td>
</tr>
<tr>
<td width="50%"><font size="3" face="Arial Narrow">Ignition Timing</font></td>
<td width="50%"><font face="Arial Narrow" size="3">10 degrees BTDC</font></td>
</tr>
<tr>
<td width="50%"><font size="3" face="Arial Narrow">Firing Order</font></td>
<td width="50%"><font size="3" face="Arial Narrow">1-4-2-5-3-6</font></td>
</tr>
<tr>
<td width="100%" colspan="2" bgcolor="#808080">
<p align="center"><b><font size="4" face="Arial" color="#FFFFFF">Capacities</font></b></td>
</tr>
<tr>
<td width="50%"><font face="Arial Narrow" size="3">Oil Capacity With Filter
Change</font></td>
<td width="50%">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><font size="3" face="Arial Narrow">5 Quarts (OHV Engines)</font></td>
</tr>
<tr>
<td><font size="3" face="Arial Narrow">5 Quarts (SOHC Engines)</font></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="50%"><font face="Arial Narrow" size="3">Cooling System Capacity
(Quarts)</font></td>
<td width="50%">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><font size="3" face="Arial Narrow">W/AC- 7.2 / W/O AC 6.5
(OHV Engines)</font></td>
</tr>
<tr>
<td><font size="3" face="Arial Narrow">13.2 Quarts (SOHC
Engines)</font></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="100%" colspan="2" bgcolor="#808080">
<p align="center"><b><font size="4" face="Arial" color="#FFFFFF">Torque
Specifications</font></b></td>
</tr>
<tr>
<td width="50%"><font face="Arial Narrow" size="3">Cylinder Head</font></td>
<td width="50%">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><font face="Arial Narrow" size="3">Torque in 3 steps [1st (22-26ft-lbs),
2nd (52-56ft-lbs), 3rd (Tighten another 90-degrees)] (OHV Engines)</font></td>
</tr>
<tr>
<td><font face="Arial Narrow" size="3">Torque in 2 steps [1st
(24ft-lbs),
2nd (Tighten another 90-degrees)] (SOHC Engines)</font></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="50%"><font face="Arial Narrow" size="3">Main Bearing Bolts</font></td>
<td width="50%">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><font size="3" face="Arial Narrow">66 - 77 ft-lbs (OHV
Engines)</font></td>
</tr>
<tr>
<td><font size="3" face="Arial Narrow">72 ft-lbs (SOHC
Engines)</font></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="50%"><font face="Arial Narrow" size="3">Rod Bearing Bolts</font></td>
<td width="50%">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><font size="3" face="Arial Narrow">19 - 24 ft-lbs (OHV
Engines)</font></td>
</tr>
<tr>
<td><font face="Arial Narrow" size="3">Torque in 2 steps [1st
(15ft-lbs),
2nd (Tighten another 90-degrees)] (SOHC Engines)</font></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="50%"><font face="Arial Narrow" size="3">Crankshaft Pulley Bolts</font></td>
<td width="50%">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><font face="Arial Narrow" size="3">Torque in 2 steps [1st
(30-37ft-lbs),
2nd (Tighten another 90-degrees)] (OHV Engines)</font></td>
</tr>
<tr>
<td><font face="Arial Narrow" size="3">Torque in 2 steps [1st
(37ft-lbs),
2nd (Tighten another 90-degrees)] (SOHC Engines)</font></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="50%"><font face="Arial Narrow" size="3">Flywheel to Crankshaft
Bolts</font></td>
<td width="50%">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><font size="3" face="Arial Narrow">59 ft-lbs (OHV Engines)</font></td>
</tr>
<tr>
<td><font size="3" face="Arial Narrow">75 - 85 ft-lbs (SOHC
Engines)</font></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="50%"><font face="Arial Narrow" size="3">Lower Intake
Manifold / Throttle Body</font></td>
<td width="50%">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><font size="3" face="Arial Narrow">Torque in 4 steps [1st
(3-6ft-lbs), 2nd (6-11ft-lbs), 3rd (11-15ft-lbs) 4th
(15-18ft-lbs)] (OHV Engines) </font></td>
</tr>
<tr>
<td><font size="3" face="Arial Narrow">7 ft-lbs (SOHC Engines)</font></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="50%"><font face="Arial Narrow" size="3">Exhaust Manifold</font></td>
<td width="50%">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><font size="3" face="Arial Narrow">19 ft-lbs (OHV Engines)</font></td>
</tr>
<tr>
<td><font size="3" face="Arial Narrow">16 ft-lbs (SOHC
Engines)</font></td>
</tr>
</table>
</td>
</tr>
</table>
</div>
<div align="center">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td width="100%">
<p align="center"><font size="4" face="Arial"><b>4.0L Firing Order</b></font></td>
</tr>
<tr>
<td width="100%">
<p align="center"><img border="0" src="diagrams/FiringOrder6a.gif" width="164" height="174"></td>
</tr>
<tr>
<td width="100%">
<p align="center"><font class="Helvetica13" size="3" face="Arial">4.0L
Engines Firing Order: 1-4-2-5-3-6 DIS Ignition System</font></td>
</tr>
</table>
</div>
<p align="left" style="margin-left: 10; margin-right: 10"><b><font face="Arial" size="4" color="#800000">Known
Problems:</font></b></p>
<p align="left" style="margin-left: 20; margin-right: 10"><font face="Arial" size="3"><b>Missing
or Bogging</b> - There are several things that could be causing
this. First off your MAF may be dirty. Check <b><a href="CleanMAF.html">HERE</a></b>
on how to clean it. Then there are the obvious - plugs, wires, dirty
injectors. Tune up items basically.</font></p>
<p align="left" style="margin-left: 20; margin-right: 10"><font face="Arial" size="3">Also,
if you get a problem with hesitation, check the wires around the exhaust.
One of the oxygen sensor wires may have been damaged by the exhaust.</font></p>
<p align="left" style="margin-left: 20; margin-right: 10"><font face="Arial" size="3"><b>Loose
Intake Manifold Bolts -</b> Some 90's 4.0L's have a problem with loose
intake bolts. Click <b><a href="4_0-loose-intake-bolts.html">HERE</a></b>
for more details.</font></p>
<p align="left" style="margin-left: 10; margin-right: 10"><b><font face="Arial" size="4" color="#000000">Performance
Parts:</font></b></p>
<p align="left" style="margin-left: 20; margin-right: 10"><font size="3" face="Arial"><b><a href="http://www.moranav6racing.com/category.html?CategoryID=32" target="_blank">Tom
Morana</a>:</b></font></p>
<p align="left" style="margin-left: 30; margin-right: 10"><font size="3" face="Arial">Offers
stroker kits, camshafts, connecting rods, pistons, cylinder heads</font></p>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td width="25%"></td>
<td width="25%" valign="bottom"><img border="0" src="images/40_stroker.jpg" width="300" height="225"></td>
<td width="25%" valign="bottom"><img border="0" src="images/40_carbintake.jpg" width="300" height="181"></td>
<td width="25%"></td>
</tr>
<tr>
<td width="25%" align="center"></td>
<td width="25%" align="center"><font size="3" face="Arial">4.0 Stroker
Kits</font></td>
<td width="25%" align="center"><font size="3" face="Arial">4.0 Intake
Manifold For Carburetor</font></td>
<td width="25%" align="center"></td>
</tr>
</table>
<p align="left" style="margin-left: 20; margin-right: 10"><b><a href="http://www.knfilters.com/" target="_blank"><font size="3" face="Arial">K&N
Filters</font></a><font size="3" face="Arial">:</font></b></p>
<p align="left" style="margin-left: 30; margin-right: 10"><font size="3" face="Arial">Carries
products including new air intake systems for some 4.0L Rangers.</font></p>
<p align="left" style="margin-left: 20; margin-right: 10"><b><a href="http://www.camcraftcams.com/" target="_blank"><font size="3" face="Arial">Camcraft</font></a><font size="3" face="Arial">:</font></b></p>
<p align="left" style="margin-left: 30; margin-right: 10"><font size="3" face="Arial">Offers
a new camshaft for the 4.0L.</font></p>
<p align="left" style="margin-left: 20; margin-right: 10"><b><a href="http://www.kustomz.com/" target="_blank"><font size="3" face="Arial">Kurtz
Kustomz</font></a><font size="3" face="Arial">:</font></b></p>
<p align="left" style="margin-left: 30; margin-right: 10"><font size="3" face="Arial">Sells
a True-Rev Sport Induction Kit.</font></p>
<p align="left" style="margin-left: 20; margin-right: 10"><font size="3" face="Arial"><b><a href="http://www.supersixmotorsports.com/" target="_blank">Super
Six Motorsports:</a></b></font></p>
<p align="left" style="margin-left: 30; margin-right: 10"><font size="3" face="Arial">Offers
heads and intakes for the 4.0L engines.</font></p>
<p align="left" style="margin-left: 20; margin-right: 10"><a HREF="http://www.compcams.com" TARGET="_parent"><b><font class="TimesRoman16" size="3" face="Arial">Competition Cams</font></b></a><b><font class="TimesRoman16" size="3" face="Arial">:</font></b></p>
<p align="left" style="margin-left: 30; margin-right: 10"><font class="TimesRoman16" size="3" face="Arial">Offers camshaft# 49-410-8 as an OEM replacement good for towing and all around performance.
Camshaft# 49-422-8 is a more aggressive cam for 4.0's with other modifications. It is designed to improve midrange power and torque.</font></p>
<p align="left" style="margin-left: 20; margin-right: 10"><b><a target="_blank" href="http://www.boosthead.com/home.php"><font class="TimesRoman16" size="3" face="Arial">Thomas
Knight</font></a><font class="TimesRoman16" size="3" face="Arial">:</font></b> </p>
<p align="left" style="margin-left: 30; margin-right: 10"><font class="TimesRoman16" size="3" face="Arial">Offers
a kit to install an Eaton supercharger on the 4.0L Ranger.</font></p>
<p align="left" style="margin-left: 20; margin-right: 10"><font class="TimesRoman16" size="3" face="Arial"><b><a target="_blank" href="http://stores.ebay.com/Banshee-Supercharger-Inc">eBay
Supercharger Kit</a>:</b></font></p>
<p align="left" style="margin-left: 30; margin-right: 10"><font size="3" face="Arial"><font class="TimesRoman16">We
found this kit on eBay to mount an Eaton supercharger on a newer SOHC 4.0
Ranger. </font><font class="TimesRoman16">The kit does not include the
supercharger. </font>The supercharger required is the 3rd generation
m90, from the 1989 thru 1993 Ford T-Bird Supercoupe. (the inlet is oval).
The manifold is all (aluminum), each port uses 2"OD aluminum 90
degree ells. There are 3-1/8" threaded pipe plugs in the manifold for
sensor, water or alcohol injection, etc. The manifold will handle
the weight of the M90 (without) additional support. This kit includes all
component parts to install an Eaton M90, 3rd generation Supercharger on a
2002 Ford Ranger 4.0 SOHC.</font></p>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td width="16%" align="center"></td>
<td width="33%" valign="bottom" align="center">
<p align="center"><img border="0" src="images/40_superchargerkit1.jpg" width="351" height="254"></td>
<td width="34%" valign="bottom" align="center"><img border="0" src="images/40_superchargerkit2.jpg" width="386" height="244"></td>
<td width="17%" align="center"></td>
</tr>
<tr>
<td width="16%" align="center"></td>
<td width="33%" valign="bottom" align="center"><img border="0" src="images/40_superchargerkit3.jpg" width="259" height="258"></td>
<td width="34%" valign="bottom" align="center"><img border="0" src="images/40_superchargerkit4.jpg" width="335" height="222"></td>
<td width="17%" align="center"></td>
</tr>
<tr>
<td width="16%"></td>
<td width="33%"></td>
<td width="34%"></td>
<td width="17%"></td>
</tr>
<tr>
<td width="16%"></td>
<td width="33%"></td>
<td width="34%"></td>
<td width="17%"></td>
</tr>
</table>
<div align="center">
<p align="left" style="margin-left: 20; margin-right: 20"><b><a href="http://www.explorerexpress.com/ranger-9807-superchargers-c-1_27.html" target="_blank"><font size="3" face="Arial">Explorer
Express</font></a><font size="3" face="Arial">:</font></b></div>
<div align="center">
<p align="left" style="margin-left: 30; margin-right: 20"><font size="3" face="Arial">Offers
the X-Charger for the 4.0 SOHC Ranger.</font></div>
<div align="center">
<p align="center" style="margin-left: 5; margin-right: 5"><font size="3" face="Arial"><img border="0" src="images/40_xcharger.jpg" width="400" height="300"></font></div>
<div align="center">
<p align="center" style="margin-left: 5; margin-right: 5"><font size="3" face="Arial">Explorer
Express X-Charger</font></div>
<div align="center">
<p align="left" style="margin-left: 30; margin-right: 10"><font size="3" face="Arial">Explorer
Express also offers headers, spark plug wires, throttle bodies, and
intake tube for the 4.0L OHV Ranger.</font></div>
<div align="center">
<p align="left" style="margin-left: 30; margin-right: 10"><font size="3" face="Arial"><b>Vortec</b>
and <b> Paxton</b> had produced superchargers for the 4.0L engine but we can no
longer find them listed.</font></div>
<div align="center">
<p align="left" style="margin-left: 20; margin-right: 10"><font size="3" face="Arial"><b><a href="http://www.bbkperformance.com/" target="_blank">BBK
Performance</a>:</b></font></div>
<div align="center">
<p align="left" style="margin-left: 30; margin-right: 10"><font size="3" face="Arial">BBK
offers 66mm throttle bodies for the 4.0L OHV Ranger.</font></div>
<div align="center">
<p align="left" style="margin-left: 20; margin-right: 10"><font size="3" face="Arial"><b><a href="http://www.airaid.com/home.asp" target="_blank">Airaid:</a></b></font></div>
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<p align="left" style="margin-left: 30; margin-right: 10"><font size="3" face="Arial">Offers
a throttle body spacer that's said to increase low end performance and
horsepower.</font></div>
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<p align="left" style="margin-left: 20; margin-right: 10"><font size="3" face="Arial"><b><a href="http://www.pacesetterexhaust.com/headers_truck.php" target="_blank">Pacesetter:</a></b></font></div>
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<p align="left" style="margin-left: 30; margin-right: 10"><font size="3" face="Arial">Pacesetter
offers headers for the 4.0L OHV Ranger.</font></div>
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<p align="left" style="margin-left: 20; margin-right: 10"><font size="3" face="Arial"><b><a href="http://www.jbaheaders.com/feature_pages/04rangernew.asp" target="_blank">JBA:</a></b></font></div>
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<p align="left" style="margin-left: 30; margin-right: 10"><font size="3" face="Arial">JBA
offers headers and ignition wires for the 4.0L Ranger.</font></div>
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<p align="left" style="margin-left: 20; margin-right: 10"><font size="3" face="Arial"><b><a href="http://www.hedman.com/" target="_blank">Hedman
Hedders:</a></b></font></div>
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<p align="left" style="margin-left: 30; margin-right: 10"><font size="3" face="Arial">Offers
headers for the 4.0L engines.</font></div>
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<p align="left" style="margin-left: 20; margin-right: 10"><font size="3" face="Arial"><b><a href="http://www.gibsonperformance.com/" target="_blank">Gibson</a></b>
and <b><a href="http://www.dynomax.com/" target="_blank">Dynomax:</a></b></font></div>
<div align="center">
<p align="left" style="margin-left: 30; margin-right: 10"><font size="3" face="Arial">Both
offer cat-back exhaust systems for the Ranger.</font></div>
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<p align="left" style="margin-left: 20; margin-right: 10"><font size="3" face="Arial"><b><a href="http://www.holley.com/index.asp?division=NOS" target="_blank">Nitrous
Oxide Systems (NOS):</a></b></font></div>
<div align="center">
<p align="left" style="margin-left: 30; margin-right: 10"><font size="3" face="Arial">Nitrous
Oxide Systems (NOS) showed the world how to effectively harness the
power of nitrous oxide for automotive use in the 1970's. Since then, NOS
has powered more racers than any other brand of nitrous. When you're
looking to go fast, rely on NOS to deliver the most power per dollar
available. From stock engines to race vehicles, jet skis to trucks, NOS
has a kit for you.</font></div>
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<p align="left" style="margin-left: 10; margin-right: 10"><b><font face="Arial" size="4" color="#000000">Modifications:</font></b></div>
<div align="center">
<p align="left" style="margin-left: 20; margin-right: 10"><font size="3" face="Arial"><b>Head
Porting:</b></font></div>
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<p align="left" style="margin-left: 30; margin-right: 10"><font class="Helvetica13" face="Arial" size="3">Port
your upper and lower intake. The intakes don't line up diameter to
diameter. Porting opens this up and allows better flow.
Knife edge the intake side of the throttle body to remove the front lip.
You can use a Dremel tool to grind, sand and buff this area to obtain a
smooth airflow in to the engine. You can also mill down the
butterfly to blend in to the shaft for a smoother air flow.</font></div>
<div align="center">
<p align="left" style="margin-left: 30; margin-right: 10"><font class="Helvetica13" face="Arial" size="3">For
details on how to port your heads, click <b><a href="http://www.therangerstation.com/tech_library/pdf_documents/head_porting.pdf" target="_blank">HERE</a>.</b></font></div>
<div align="center">
<p align="left" style="margin-left: 20; margin-right: 10"><font class="Helvetica13" face="Arial" size="3"><b>Ignition:</b></font></div>
<div align="center">
<p align="left" style="margin-left: 30; margin-right: 10"><font class="Helvetica24" face="Arial" size="3">MSD
- </font><font class="Helvetica13" face="Arial" size="3">Manufactures a
DIS ignition system along with wiring harnesses. Find their parts
at <a href="http://www.summitracing.com" target="_blank"><b>Summit
Racing</b></a><b>.</b></font></div>
<div align="center">
<p align="left" style="margin-left: 30; margin-right: 10"><font class="Helvetica13" face="Arial" size="3">JetChip
- Makes a module to reprogram the engines computer. Click <b><a href="http://www.jetchip.com/" target="_blank">HERE</a>.</b></font></div>
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<p style="margin-left: 10; margin-right: 10"><b><font face="Arial" size="4" color="#000000">4.0
Computer Numbers Submitted by:</font></b> <font face="Arial" size="4" color="#000000"> <b>skineral</b></font></div><div align="left">
<p style="margin-left: 30; margin-right: 10"><font face="Arial"><font size="3">1991
Explorer 4.0 Manual Transmission 4x4</font></font></div><div align="left">
<p style="margin-left: 50; margin-right: 10"><font face="Arial" size="3">Calf 3006 (F07F-12A650-YA) & (F07F-VAMR)<br>
Fed 3007 (F07F-12A650-VA) & (F07F-VAMR)</font></div><div align="left">
<p style="margin-left: 30; margin-right: 10"><font face="Arial" size="3">1992 Explorer 4.0 Manual
Transmission 4x4</font></div><div align="left">
<p style="margin-left: 50; margin-right: 10"><font face="Arial" size="3">Calf 3397 (F27F-12A650-VC) & (F27F-12A650-VCMR)<br>
Fed 3398 (F27F-12A650-TC) & (F27F-12A650-TCMR)</font></div><div align="left">
<p style="margin-left: 30; margin-right: 10"><font face="Arial" size="3">1993
Explorer 4.0 Manual Transmission 4x4</font></div><div align="left">
<p style="margin-left: 50; margin-right: 10"><font face="Arial" size="3">Calf 3729 ( F37F-12A650-XB) & (F37F12A650-CRA)<br>
Fed 3726 (F37F-12A650-UC) & (F37F-12A650-YR) & (YMBR)</font></div><div align="left">
<p style="margin-left: 30; margin-right: 10"><font face="Arial" size="3">1990 Ranger 4.0
Manual Transmission 4x4</font></div><div align="left">
<p style="margin-left: 50; margin-right: 10"><font face="Arial" size="3">
Calf 3064 (F07F-12A650-P1A)<br>
Fed 3065 (F07F-12A650-M1A)</font></div><div align="left">
<p style="margin-left: 30; margin-right: 10"><font face="Arial" size="3">1991 Ranger 4.0
Manual Transmission 4x4</font></div><div align="left">
<p style="margin-left: 50; margin-right: 10"><font face="Arial" size="3">
3065 ( F07F-M1A)<br>
3256 (F17F-ADA)</font></div><div align="left">
<p style="margin-left: 30; margin-right: 10"><font face="Arial" size="3">1992
Ranger 4.0 Manual Transmission 4x4</font></div><div align="left">
<p style="margin-left: 50; margin-right: 10"><font face="Arial" size="3">3433</font></div><div align="left">
<p style="margin-left: 30; margin-right: 10"><font face="Arial" size="3">1993
Ranger 4.0 Manual Transmission 4x4</font></div><div align="left">
<p style="margin-left: 50; margin-right: 10"><font face="Arial" size="3">
3723 (F37F-LA)</font><font face="Arial" size="2"><br>
</font></div>
<p style="margin-left: 10; margin-right: 10"><b><font face="Arial" color="#000000" size="4">Cylinder
Head Diagrams:</font></b></p>
<p align="center"><img border="0" src="diagrams/40_headinstall.gif" width="770" height="535"></p>
<p align="center"><font size="3" face="Arial"><b>4.0 OHV Cylinder Head
Install</b></font></p>
<p align="center"><img border="0" src="diagrams/40_cylinderheadtorque.gif" width="362" height="234"></p>
<p align="center"> </p>
<p align="center"> </p>
<p align="center">  
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