Mahle 41699 Plasma-Moly OE Ring Set for 1993-1994 Cadillac 4.6L Northstar V8 STD

Vehicle Fitment

• 1993 Cadillac Allante (Base, Indianapolis 500 Pace Car; 4.6L DOHC Northstar V8, VIN Y)
• 1993 Cadillac Eldorado (Sport, Touring; 4.6L DOHC Northstar V8, VIN Y)
• 1993 Cadillac Seville STS (4.6L DOHC Northstar V8, VIN Y)
• 1994 Cadillac DeVille Concours (4.6L DOHC Northstar V8, VIN Y)
• 1994 Cadillac Eldorado (Base, Touring ETC; 4.6L DOHC Northstar V8, VIN Y)
• 1994 Cadillac Seville SLS, STS (4.6L DOHC Northstar V8, VIN Y)

Fitment Notes

• Fits the early-generation GM Northstar 4.6L DOHC V8 (281 cu. in., VIN code "Y") for 1993-1994 model years only; not compatible with 1995+ Northstar applications
• Standard bore (STD) - for use with an unmodified 3.661" cylinder bore; oversize variants (.010, .020, .030) are available under suffixed part numbers
• Confirm VIN code (8th character) is "Y" before ordering; 1993 Seville STS used the L37 (VIN Y) Northstar, while base Seville retained the 4.9L V8
• For 1994 DeVille, Northstar fitment applies to the Concours trim only; base DeVille retained the 4.9L V8 through 1995

Features

• Plasma-moly inlaid top compression ring for superior wear resistance, efficient break-in, and long-term combustion sealing in the high-revving Northstar V8
• Reverse-twist second ring with taper-race machining for enhanced groove-side sealing and improved oil control on both intake and exhaust strokes
• CP-20 three-piece oil control ring assemblies with an exclusive 20-degree ear angle for the best possible side seal within the piston oil ring groove
• Pre-lapped ring faces seat immediately upon installation, virtually eliminating extended break-in time
• CNC-controlled gap chamfer on compression rings optimizes compression retention and minimizes blow-by
• Barrel-faced top ring contact area promotes more efficient compression sealing under the Northstar's high operating temperatures and RPM range

Specifications

• Engine: GM 4.6L DOHC Northstar V8 (281 cu. in., VIN Y, 32-valve)
• Bore Diameter: 3.661" (93 mm) - Standard (STD)
• Top Ring Thickness: 1.5mm
• Top Ring Coating: Plasma-moly
• Second Ring Thickness: 1.5mm
• Second Ring Design: Reverse-twist, taper-faced
• Oil Ring Thickness: 3.0mm
• Oil Ring Type: CP-20 three-piece assembly
• Oversize: Standard (STD) - oversize variants available with suffix (.010, .020, .030)
• Cylinder Count: V8 (8 complete ring sets per package)

Included Components

• 8x Plasma-moly top compression rings (1.5mm)
• 8x Reverse-twist taper-faced second compression rings (1.5mm)
• 8x CP-20 three-piece oil control ring assemblies (3.0mm)

Product Description

The MAHLE 41699 is an OE-replacement plasma-moly piston ring set engineered specifically for the first-generation GM Northstar 4.6L DOHC V8 (VIN Y) as used in 1993-1994 Cadillac Allante, Eldorado, Seville, and DeVille Concours models. The Northstar was GM's most technically advanced engine at the time of its introduction, featuring an all-aluminum block and head, 32 valves, and a high-revving character that placed unique demands on internal components. These rings are built to meet those demands, with a plasma-moly top ring that delivers dependable sealing under elevated temperatures and pressures, and a reverse-twist second ring that effectively controls oil migration and maintains groove-side sealing throughout the engine's wide RPM range.

As a MAHLE Original product, the 41699 is manufactured to the same form, fit, and function standards that MAHLE supplies to OEM engine builders worldwide. Pre-lapped faces minimize break-in time, and the CP-20 oil control ring's exclusive 20-degree ear angle ensures the best possible side seal within the piston groove. This set is offered at standard bore (STD) for use with an unmodified 3.661" cylinder bore; builders working with bored cylinders should select the appropriately suffixed oversize variant.