Michigan Motorsports Piston Ring Set for 4.8L & 5.3L LS Engines — 3.779" Stock Bore, Hastings Moly 1.5/1.5/3.0mm

High-quality Michigan Motorsports 2M4978 piston ring set engineered to restore compression and control oil for 4.8L and 5.3L LS engines with a 3.779" (96mm) stock bore.

This complete Hastings-brand replacement ring kit fits a wide range of GM LS-family engines — including LM7, L59, LS4, LY5, LMG, LMF, LH6, LC9 and L33 — and is built to OEM-level standards for rebuilds and upgrades. The set comes in the original standard bore sizing for 1999–2015 4.8L and 1999–2013 5.3L applications, using a 1.5mm, 1.5mm, 3.0mm ring thickness layout and mixed-material construction to balance wear resistance and sealing performance.

Will these rings fit my LS engine without machining?

If your pistons use the stock 3.779" (96mm) bore dimension, this set is made to drop in without additional oversized bores or custom machining. The kit is supplied in standard bore size to match factory-spec pistons common in many 1999–2015 GM small-blocks.

• Standard 3.779" (96mm) bore compatibility for stock LS pistons
• Intended for standard-size rebuilds—no oversize rings included
• Check VIN and engine code cross-reference before ordering

What materials and ring arrangement are used in this set?

The Hastings-based construction combines different metals tailored to each ring's job: a steel top ring for strength, a grey iron second ring for wear and scraping, and a multi-piece oil ring with steel rails plus a stainless expander for dependable oil control. That material mix aims to deliver durable sealing and stable wear across varied driving conditions.

• Top ring: hardened steel for ring face durability
• Second ring: grey iron to aid blow-by control and seating
• Oil ring: steel rails with stainless expander for oil regulation
• Common configuration: 1.5mm / 1.5mm / 3.0mm thicknesses

Which specific engines and model years does this kit cover?

This ring set was produced to match many GM LS-series engines over a broad year range. It is compatible with multiple VIN and engine code combinations on 4.8L and 5.3L platforms used in cars, trucks and vans.

• 4.8L coverage: 1999–2015 with VIN codes A, C, V, O, 7, 4
• 5.3L coverage: 1999–2013 including LC9, LS4 and VIN codes 0, 3, 4, B, C, J, L, M, P, T, Z
• Fits engine families: LM7, L59, LS4, LY5, LMG, LMF, LH6, LC9, L33

How will these rings perform in rebuilds and upgraded engines?

Built to OEM-quality specifications, this Hastings set is suitable for refreshed stock engines and mild performance builds where retaining factory bore size is desirable. They provide reliable sealing and oil control for daily driving, towing, and moderate-power upgrades when proper break-in and installation practices are followed.

• Good for stock rebuilds and moderate performance use
• OEM-quality fit and materials for consistent ring life
• Requires correct ring end-gap and cylinder honing at install

Who this is for: Technicians and DIY enthusiasts rebuilding Chevrolet/GMC LS-based 4.8L or 5.3L engines who need a standard-bore, Hastings-manufactured moly ring set that matches factory piston dimensions. Choose this kit if you want an OEM-grade replacement for stock-bore rebuilds, compatibility across common GM VIN codes and engine families, and a durable multi-material ring arrangement recommended for everyday driving and light performance upgrades.