Cahoon520 Posted April 24, 2009 Report Share Posted April 24, 2009 Do I need the machine shop to replace the exhaust valve seats with hardened ones. My truck is a 68 520 that was before unleaded gas right? Quote Link to comment
sssr20det510 Posted April 24, 2009 Report Share Posted April 24, 2009 I belive in the us that the gas now has additives in them so youi dont have to worry about it Quote Link to comment
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