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Well firstly all machine work is usually measured in standard rather than metric, so make sure its actually .50mm over and no .050" over.
86mm is the stock bore size.
Once you verify the size then you'll know what size piston to buy, so for example a block bored to 86.50mm would take 86.50mm pistons.
As far as brands go it's mostly person preference, but these are usually based on budget. As far as my opinion and my opinion as a Mazworx employee I'd recommend going with CP pistons which will set you back about $650 give or take where you buy from and the mark up, I want to say our sets retail for $635. We use CP in every build that we do from stock rebuilds to our 1400hp drag car.
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