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Mahle MS piston ring support rails specified as 3.898 (LS1) with 3mm thickness and a 3.860–3.910 fitment range are supplied as precision support rails for compatible ring assemblies. These rails control oil scraping and maintain ring alignment in engines matching the listed bore dimensions and should be paired with corresponding piston rings and grooves for correct operation.
Mahle MS 3.898-(LS1) 3mm Support Rail
