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Why so few SD.80 MACS?
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The 80Mac and the 90Mac are the same unit. The only diffrence is the engine. If you took out the 20cylinder 710 you could in you wanted to drop an H-block in and have a <br />90Mac. I also rember reading that EMD tested a new turbochargerthat boosted the <br />20-710 to 5500Hp;a short jump to 6000HP
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