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#1
07-06-2013, 11:52 AM
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603.97 vs 603.971 engines
Are the 603.971 engines more reliable than the 603.97. I need to replace the engine in a 91 350 SDL. Also thinking of looking around for a used 603.961. Which is the best choice? Will the engines interchange? I heard the only thing needed for a .961 engine swap was motor mounts, is this correct? What is needed for .97 to .971 exchange?
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#2
09-19-2013, 10:40 AM
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The .971 has a higher redline than the .970. The turbocharger is different (vacuum control vs pressure control). Other then that they should be about the same I'd think. There might be a difference in the oil pan
 -J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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