Gen III Hemi Engine Mahle Custom Pistons
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The Mahle custom pistons swinging from Callies Compstar rods look like factory pieces. Bob says it was tricky getting the valve notch depth and location to work correctly while maintaining ample distance from the top ring groove to the notch, but Mahle was able to make it work. A small dish ended up landing compression at a 91-octane–friendly 11.2:1. View Related Article
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