Anything over 6G's or if you plan on allot of racing then I'd go with NSAs. Using NSA has so many benefits, weight reduction, spring/retainer options and guide plates gives you much more control of the rockers. If a S/A rocker comes loose you take a real risk or serious damage. Whenever possible I perfer double springs and a NSA set-up.
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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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