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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
Boss heads vs ported coyote heads
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<blockquote data-quote="pufferfish" data-source="post: 13406570" data-attributes="member: 153725"><p>until someone does a head to head comparison (NOT the magazines...they get paid by the people who port), its all speculation. my .02 is ford did exhaustive work on the gt heads to make them the most fabulous stock heads on the planet. then they got to blank slate a second set of heads and came up with the boss version, which shares nothing with the gt heads but outside appearance and valvetrain architecture.</p><p></p><p>There are no flow numbers for the boss heads other than printed articles stating 4-6% flow increase on the intake and 10% increase on the exhaust. ported heads will add more than this, but they do so with larger port volumes (boss heads have the same runner volume as gt heads). larger port volumes may flow more, but they kill velocity. so, much like the boss vs gt intake, you lose low end to gain top end.</p></blockquote><p></p>
[QUOTE="pufferfish, post: 13406570, member: 153725"] until someone does a head to head comparison (NOT the magazines...they get paid by the people who port), its all speculation. my .02 is ford did exhaustive work on the gt heads to make them the most fabulous stock heads on the planet. then they got to blank slate a second set of heads and came up with the boss version, which shares nothing with the gt heads but outside appearance and valvetrain architecture. There are no flow numbers for the boss heads other than printed articles stating 4-6% flow increase on the intake and 10% increase on the exhaust. ported heads will add more than this, but they do so with larger port volumes (boss heads have the same runner volume as gt heads). larger port volumes may flow more, but they kill velocity. so, much like the boss vs gt intake, you lose low end to gain top end. [/QUOTE]
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2011-2014 Mustangs
Engine/Tuning
Boss heads vs ported coyote heads
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