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9 Next to seasoned factory hypereutectic 5.7 pistons is one of our project's Mahle forged pistons, with coated skirts. Though not visible in this shot, it's dome profile is about the same as the factory slug, giving our 392 a static compression of around 10.5:1 (with its reworked cylinder head chambers). You can see that the 1.5/1.5/3.0mm ring grooves are moved farther down from the piston top than in the factory configuration, providing room for valve relief cutouts that will allow a decently aggressive cam. Piston weight is about 439 grams.