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I'll guess you are going to loose about 5 MPG on the highway.
With my heads/cam LT1 = With 3:23 I was about 24MPG on long runs, with 3:42s I pickeed up a bit, around 26. With 3:73s I dropped to 20.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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