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1978 911SC Engine Maintenance Priorities

Engine

Vehicle Information: Model: 911 SC ; Year: 1978; Body Type: Coupe; Total Mileage: 236,000;

Over the winter I would like to address several needs of my car. Althoughmy car runs very well, I've read upgrading my stock tensioners is a must.I also need to replace my heat exchangers. Having over 236,000 miles onmy engine without any records of a rebuild, is it necessary to upgrade mytensioners or should I use the money to replace exchangers? What kind ofheat exchangers should I use, i.e., SSI?Also, what is your opinion about attempting to boost horsepower andperformance by changing the exhaust system to pre-1974 systems andconverting to Weber carburetors?

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