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Re: Big Block Rev Limit
Do alot more than 4200. Though it's hard to say just how high you can go without knowing what was done. But I'd say 5500, after that probly fall on it's face.
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2000 GMC CCSB 454/4L80 6” lift SAS
1999 Chevy CCSB 454/NV4500 6” lift
1999 GMC Yukon 350/4L60 4" SAS
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