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They are not aftermarket, but maybe off another make/model of truck. These aren't cheasy aluminum blocks. I will take a pic of it and post it. If burbs have 7 stock, then I guess this thing is at normal stance, inless someone put lift springs in the front and the blocks in the rear.....
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2000 GMC CCSB 454/4L80 6” lift SAS
1999 Chevy CCSB 454/NV4500 4” SAS
1999 GMC Yukon 350/4L60 6" SAS
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