Another issue regarding Olds 455 versus the 400 and 425. parts. 455 parts are still readily avilable from most aftermarket suppliers such as Sealed Power, Clevite, etc. You will jump through hoops, or go to an Olds-specific place, to get pistons for a 400. 425 parts? ***gettaboutit.... The 455 would be a much easier ordeal.
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