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The ARP upper rocker cover bolt kit for GM Duramax LLY-LMM 6.6L engines includes stainless-steel 12-point fasteners intended to replace OEM upper rocker cover bolts. As a direct-fit replacement, it eases reassembly after maintenance, providing corrosion resistance and consistent clamping at the cover flange to help maintain a tight seal on demanding diesel engines.
ARP GM Duramax LLY-LMM 6.6L SS 12pt upper rocker cover bolt kit
