Ultima 2M5538S-005 Big Bore Twin Cam Piston Ring Set, .005 Oversize

Moly piston ring set is for 4.0 inch bore and is .005 oversize. Set includes two 1/16 inch compression rings and one 3.0mm oil ring.

The Ultima 2M5538S-005 Big Bore Twin Cam piston ring set is designed for engines using a 4.000-inch bore with pistons requiring .005-inch oversize rings. This replacement set helps restore proper cylinder sealing, support compression, and maintain controlled oil usage when rebuilding or servicing compatible Twin Cam engines. The moly ring material provides a durable friction surface suited to performance-oriented engine applications.
The set includes two 1/16-inch compression rings and one 3.0 mm oil ring for a complete piston ring configuration. Proper ring selection, cylinder preparation, and end-gap adjustment are essential for reliable operation, so confirm the piston, bore, groove, and application specifications before installation. The .005-inch oversize designation should be matched to the final cylinder bore measurement and piston requirements.
Manufactured by Ultima, part number 2M5538S-005, this piston ring set is supplied as one complete set and is made in the USA. It is a practical replacement component for engine builders, repair professionals, and enthusiasts seeking consistent fit and dependable sealing performance during an overhaul.

Features:

• Brand: Ultima

• Part Number: 2M5538S-005

• Application: Big Bore Twin Cam engines

• Bore Size: Designed for a 4.000-inch bore

• Oversize: .005 inch

• Material: Moly piston rings

• Compression Rings: Two 1/16-inch rings included

• Oil Ring: One 3.0 mm oil ring included

• Unit of Measure: Set

• Country of Origin: USA

• Accessory Items: None