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Message: <blockquote data-quote="chris91" data-source="post: 1256404" data-attributes="member: 9338">Came across this article and figured it would be a nice addition to the 2v section. Have at it my brethren! Romeo,       Windsor, Teksid, WAP- What's In A Name?       In       a nut shell, not all 4.6L engines are built the same. Start reading the       multitude of forums on the internet and you'll see people referring to the       4.6L engines using names like Windsor, Romeo and Teksid. So what do the       names mean?       Romeo       -  Romeo is an engine plant. The first 4.6L engines built were produced in Romeo Michigan       beginning in 1991 which was Fords old tractor plant just outside of       Detroit. Most           Romeo blocks are marked with an "R" in the block.       Windsor       - Windsor refers to the Windsor engine plant in Windsor, Ontario       Canada. Ford added this second engine plant in 1997 to produce 4.6L and       5.4L engines. As noted above, 1997 was the first year the 4.6L showed up       in the F-150.           Windsor           blocks are all marked with a "W" in the block in two           places.       Teksid       - Teksid just refers to aluminum blocks made from 1993-1999 by Teksid       in Italy. The engine itself was assembled in Romeo, Michigan. The Teksid       blocks are said to be capable of handling 1,200 horsepower.                          <table style='width: 100%'><tr><td>       Fiat owns Teksid       S.p.A., the largest iron foundry group in the world       with a production capacity of approximately 600,000 tons annually. The       company was established in December 1978; it designs and produces cylinder       blocks, cylinder heads, exhaust manifolds, drive shafts, camshafts and       components for automobiles and commercial vehicles. Teksid, which is       specialized in casting and processing iron, has plants in France,       Portugal, Poland, Brazil, Mexico and China. Since 2007, Teksid S.p.A. runs       also Teksid Aluminum S.r.l. a company specialized in casting and producing       auto components from aluminium alloys. </td></tr></table>                        Windsor       Aluminum Plant (WAP) - Not       all aluminum blocks were built by Teksid. The Windsor Aluminum Plant began       production of aluminum blocks in 1999. Determining       Engine Type By VIN:       It       is possible to determine if you have a Romeo or Windsor engine by looking       at the 8th character in the vehicles VIN number. VIN 3 for the Ford trucks refers to the supercharged SOHC Lightning       engine.       VIN 6 refers to 4.6L SOHC Windsor produced engines.      VIN W refers to 4.6L SOHC Romeo produced engines.      VIN X refers to 4.6L SOHC Windsor produced Mustang engines.       Here       is a partial list of vehicles and the engines that came in them: <table style='width: 100%'><tr><td>Year</td><td>Make               / Model</td><td>Engine               (VIN Code)</td></tr><tr><td>1992-2003</td><td>Ford Crown Victoria</td><td>Romeo SOHC (W)</td></tr><tr><td>1997-2003</td><td>Ford Expedition</td><td>Windsor SOHC (6)</td></tr><tr><td>1994-1997</td><td>Ford Thunderbird</td><td>Romeo SOHC (W)</td></tr><tr><td>1997-2003</td><td>Ford Truck</td><td>Romeo SOHC (W) & Windsor               (6)</td></tr><tr><td>1997-2003</td><td>Ford Van</td><td>Romeo SOHC (W)</td></tr><tr><td>1991-2003</td><td>Lincoln Town Car</td><td>Romeo SOHC (W)</td></tr><tr><td>1992-3003 </td><td>Mercury Marquis</td><td>Romeo SOHC (W)</td></tr><tr><td>2002-2003</td><td>Mercury Mountaineer</td><td>Windsor SOHC (6)</td></tr><tr><td>1994-1997</td><td>Mercury Cougar</td><td>Romeo SOHC (W)</td></tr><tr><td>1996-2003</td><td>Ford Mustang</td><td>Windsor SOHC (X) & Romeo               (W)</td></tr></table> The       Mustang can be found with the Romeo or Windsor engine. The 1996-1998       and 2001-2004 Mustang GTs used Romeo engines. The 1999 and most 2000       Mustang GTs had Windsor engines. What's       The Difference In Blocks?       There       are a variety of differences between the Romeo and Windsor engine       blocks.        Although Romeo and Windsor       Modular engines look the same on the surface, they're different inside.       Here are the basic differences in Romeo and Windsor engines:        <ul> <li data-xf-list-type="ul">Romeo           was the only Modular engine plant from 1991-1995. </li> <li data-xf-list-type="ul">Windsor           came on line for 1996 to build 4.6L and 5.4L SOHC engines for trucks           and vans. </li> <li data-xf-list-type="ul">Although           Romeo is primarily a car engine plant, it has produced Modular engines           for trucks. </li> <li data-xf-list-type="ul">Although           Windsor is primarily a truck engine plant, it produced Modular engines           for the 1999-2000 Mustang GT. </li> <li data-xf-list-type="ul">Although they look similar, Romeo           engines employ different blocks, heads, and cranks than Windsor. </li> <li data-xf-list-type="ul">Most           Romeo blocks are marked with an "R" in the casting. </li> </ul>                  <img src="http://www.therangerstation.com/Magazine/Summer2010/4_6/romeo_stamp.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <ul> <li data-xf-list-type="ul">           Windsor           blocks are all marked with a "W" in the casting in two           places. </li> <li data-xf-list-type="ul">Romeo           heads employ bolt-on cam journal girdles. </li> <li data-xf-list-type="ul">Windsor           heads don't have cam journal girdles, just individual journals. </li> <li data-xf-list-type="ul">Because           Romeo and Windsor engines have different timing cover/cam cover bolt           hole sizing, it is best to use Romeo heads and blocks together and           Windsor heads and blocks together. </li> <li data-xf-list-type="ul">Romeo           blocks have jackscrew cross-bolted main caps. </li> <li data-xf-list-type="ul">Windsor           blocks have dowel pin cross-bolted main caps. </li> <li data-xf-list-type="ul">Romeo           engines have primarily six-bolt flywheel/flexplate flanges. </li> <li data-xf-list-type="ul">Windsor           engines have eight-bolt flywheel/flexplate flanges. </li> <li data-xf-list-type="ul">Oil           filter/cooling neck types vary depending on vehicle type. Timing cover           depends on vehicle type. </li> <li data-xf-list-type="ul">Romeo           cam sprockets are zero-fit and slip right on. </li> <li data-xf-list-type="ul">Windsor           cam sprockets are pressed on. </li> <li data-xf-list-type="ul">Romeo           cam covers have 11 bolts. </li> <li data-xf-list-type="ul">Windsor           cam covers have 13 bolts. </li> <li data-xf-list-type="ul">Different           timing covers for SOHC and DOHC. </li> <li data-xf-list-type="ul">Same           basic timing chain/sprocket system for both SOHC and DOHC. </li> <li data-xf-list-type="ul">DOHC           engines have secondary timing chains for secondary camshafts. </li> <li data-xf-list-type="ul">SOHC           has a standard oil pump and DOHC has high volume </li> </ul>SOURCE: <a href="http://www.therangerstation.com/Magazine/Summer2010/Ford_4-6.htm" target="_blank">http://www.therangerstation.com/Magazine/Summer2010/Ford_4-6.htm</a></blockquote>