The 260 head will change the compression ratio, and might make it so high that it won't work with pump gas.

These heads can be fixed up almost no matter what's wrong with it. I had one corroded between combustion chamber and water jacket. They welded it up and it's still on the car. That was in 2000.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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