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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
Would you port Gen 1 heads or pick up Gen 2 heads?
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<blockquote data-quote="assasinator" data-source="post: 15504056" data-attributes="member: 105188"><p>i am swapping to 15+ heads, no question.</p><p></p><p>a bowl blend, back cut, undercut stainless valves and i find it hard to believe that most cnc 11-14 heads can match it. sand roll the ports a little to fix the sand casting. thats all i will do. a person will gain about 11-14 cfm at low lift just from the valves. ive seen an amateur sand roll gain 7 cfm in a b head 4v.</p><p></p><p>just a few cfm over stock 15+ is enough. mill it .025. done. if the 15 heads do in fact match boss heads, most cnc heads will fall behind pocket ported revalved 15+ heads imo.</p></blockquote><p></p>
[QUOTE="assasinator, post: 15504056, member: 105188"] i am swapping to 15+ heads, no question. a bowl blend, back cut, undercut stainless valves and i find it hard to believe that most cnc 11-14 heads can match it. sand roll the ports a little to fix the sand casting. thats all i will do. a person will gain about 11-14 cfm at low lift just from the valves. ive seen an amateur sand roll gain 7 cfm in a b head 4v. just a few cfm over stock 15+ is enough. mill it .025. done. if the 15 heads do in fact match boss heads, most cnc heads will fall behind pocket ported revalved 15+ heads imo. [/QUOTE]
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Engine/Tuning
Would you port Gen 1 heads or pick up Gen 2 heads?
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