For Stroker applications (-.050") Bore: 90mm (3.543") Clearance .0025" (@.850 down from oil land)
Contents: Piston, Wristpin and Clips. Use DJ-4290 rings.
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If your gonna make any kind of real power you need one of these. Used with the stroker crank it will make a 420cc into a 440cc. Its really the best option for a 420cc race build.