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Old 11-22-2012, 06:27 AM   #8
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Location: Belmont, NC
What I Drive: 2000 ZX3 / 2002 SVT Turbocharged

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It depends , the first FR heads came with argr valves , better springs and changed retainers ,
The later FR head came with larger valves , stock springs and changed retainers , the chainged retainers were stock but heat treated to black

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