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  1. Hello all, I'm just doing some research on new oversized pistons for my 1965 1147cc Spitfire engine which is currently at the machine shop being inspected and measured up. It currently has .030 oversized bores and will need to go to either .040 or .060 (depending on how the inspection goes this week). I found this an incredibly helpful comparison between NOS and aftermarket pistons (http://www.wbclassics.com/tech/tr6/engine/triumph-tr6-cast-piston-comparison). My engine builder is old school and specifically asked me to find NOS pistons if I could and didn't like the quality of County, alt
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