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Getting the 5.8 piston to survive 2,000-psi cylinder pressures meant adding a lot of mass to the center of the piston crown, plus bringing the piston pin bosses inward for increased support. The pin bosses are even angled inward in a slight pyramid shape to better support the piston dome. Considerable finite element analysis was expended to develop this shape, which helps conserve weight. Even so, piston weight grew from 342 grams in the 5.4 to 403 grams in the 5.8.