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By removing the spring around the top of the PC seals, a bit more oil is allowed to run down the exhaust valve stem. According to Gianoli, this results in extra cooling for the exhaust valves while still providing proper oil control for street use.
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 By removing the spring around the top of the PC seals, a bit more oil is allowed to run down the exhaust valve stem. According to Gianoli, this results in extra cooling for the exhaust valves while still providing proper oil control for street use.  View Related Article

 

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