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We can always count on seeing 4.6 Ford engines in the junkyard. You can find iron-block, SOHC 4.6 engines all day long in Thunderbirds, Cougars, and fullsize cars, and it's not unusual to see an all-aluminum DOHC 4.6 Mark VIII engine, either (shown in this photo). Why are they so plentiful? We can only speculate that it's because modular engines aren't easily swappable into older cars. They are physically so much larger than any pushrod engine they would replace that the chassis modifications required to get these things to fit an older car scare many people away. The 4.6 engines aren't the only members of the modular family, which also includes the SOHC and DOHC 5.4 engines in trucks and SUVs, the SOHC 6.8L V10, and the '05-and-later 4.6 and 5.4 three-valve engines. Good luck finding any of these in the yard; we've only seen one—a SOHC 5.4 in an F-350.