So last night John Mihovetz went 5.88 @ 250 in Las Vegas. This was in his Accufab sponsored, 4.6L 4V Mod Motor Mustang. This uses the factory casting block and heads (ported).
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Ya, they have those motors dialed in and pretty reliable. As well as they can be. I know a couple years ago Jason Starck talked to Mihovetz several times about what it takes to make them last at 1,500+ hp levels. Jason changed to a different style motor and have not heard much from Vito this year. Hopefully he is keeping his together.