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A Mahle plain piston ring set specified for Napier THM-13 applications with sizing of 3.927 in bore and 1.2 mm ring thickness plus .135 in ring width. This plain ring set is offered as a replacement matching the listed dimensions for engine rebuilds or maintenance where exact ring sizing is required to match the Napier THM-13 specification.
Mahle Rings Performance Napier THM-13 3.927 x 1.2MM .135inRW Plain Ring Set
