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Return to Parts List Category : J- Rare or Obsolete Engines EGG L2014-8.040 PISTONS, '57 392C.I. HEMI 4.040" BORE SET OF 8 A-332 CAST ALUM ALLOY PISTONS. 5/64-5/64-3/16 RING PKG. $0.00 CONTACT US FOR CURRENT PRICING AND AVAILABILITY Early Hemi power remains unmatched on the street and the strip. In 1957 the displacement of the earlier Hemis grew to 392 cubic inches and the short-stroke overhead valve Hemi was a favorite of early drag racers and set many speed records.  This is a Cast aluminum alloy Hemi 392 pistons with a  3.90˝ stroke at 9.25:1 compression ratio. You can get from 325-375 horsepower on a stock set-up with this set of slugs in your sleeves.