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No, do not go with a 58MM TB unless you are 100% sure you need it ( stroker, forced induction, 6500+ RPMs). The 58 is too big and can actually hurt both low end performance and ET. A 52MM TB would be a better option on a NA, 350 or 355 CI motor.
My cam/head motor made 329 RWHP and ran 13.0, I switched to a 58MM and lost 2 tenths, put the 52 back on and was right back at 13.0!
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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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