EvolutionM - Mitsubishi Lancer and Lancer Evolution Community
Stock evo 9 headstud at about 9.5mm. Oil travels up this bolt between head bolt hole and this shaft. My guess is the bolt hole is 12mm. It's a huge reduction of annular space to use thr ARP stud.
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2006EvoIXer December 27, 2017
Stock evo 9 headstud at about 9.5mm. Oil travels up this bolt between head bolt hole and this shaft. My guess is the bolt hole is 12mm. It's a huge reduction of annular space to use thr ARP stud.

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Stepping my IX up for 91/E85, looking for final preparation suggestions

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