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One of the benefits of a leakdown test is the ability learn more about the source of a compression leak. If you get #6 at TDC and pressurize it, then you will know whether it is holding that pressure and, if not, some information about where the leak is. If the exhaust valve is bent, the hissing will be in the exhaust.
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Man of Carbon Fiber (stronger than steel)
Mocha 1978 911SC. "Coco"
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