Sealed Power E-378X Engine Piston Ring Set

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Sealed Power E-378X Engine Piston Ring Set

Brand	Sealed Power E-378X
Cylinder Quantity	8
File Fit	N
File Fit (Y/N)	N
Standard Size	Standard size
Fits	Buick, Oldsmobile, and Pontiac · 39 vehicles

Standard size. Fits as a direct replacement for a standard piston ring set.

Vintage components. Restores classic engine rebuilds with like-new performance.

ISO & QS certified. Manufactured for consistent performance and longevity.

Cross-references AMS Automotive 4454, Carlson 7818 and Roadmax C1710 for the same application. See all 9.

$120.39Free shipping

In stock · usually ships same day before 1pm CST

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Engine Piston Ring Set for Classic V8 Rebuilds

Sealed Power E-378X is a standard-size engine piston ring set for vintage V8 applications that need accurate sealing and dependable cylinder pressure control. Built for 1977-1979 Oldsmobile, Pontiac, and Buick passenger cars, it supports restoration work on engines where original-style performance matters.

This piston ring set is a direct fit for classic rebuilds such as the Oldsmobile 98, Delta 88, Cutlass, and Toronado, as well as Pontiac Bonneville, Catalina, Firebird, Grand Prix, LeMans, and Buick LeSabre, Riviera, and Century applications. The E-378X part number is also referenced in interchange listings for related service applications.

Key Features

Standard-size piston ring set for vintage engine rebuilds
Fits 8-cylinder applications
Non-file-fit design for straightforward ring selection
Built with materials selected for sealing performance and service life
Manufactured under ISO and QS certified processes
Sealed Power E-378X for classic GM passenger car engines

Detailed Product Overview

Sealed Power Vintage components are made for engines more than 35 years old, with coverage aimed at restoring classic drivetrains to reliable operating condition. The E-378X piston ring set is sized for standard bore applications and is suited to rebuilds where maintaining compression, oil control, and consistent combustion sealing are priorities. For restorations involving Oldsmobile 98, Pontiac Firebird, or Buick Riviera models, this ring set provides the correct foundation for a proper engine refresh.

This part cross-references AMS Automotive 4454 and Carlson 7818 for the same application.

What This Part Helps Address

Low compression from worn or tired piston rings
Excessive oil consumption caused by poor ring sealing
Blow-by that can affect crankcase pressure
Uneven cylinder sealing during a vintage engine rebuild
Loss of original-style drivability in classic V8 engines

Installation Notes and Tips

Confirm cylinder bore condition before assembly and verify that standard-size rings match the engine specification. Because this is a non-file-fit ring set, ring end gaps should still be checked during installation and matched to the engine builder’s measurements. Clean ring grooves thoroughly and follow the service manual for break-in and lubrication procedures.

Quality Assurance

Sealed Power Vintage components are produced with leading-edge materials and ISO/QS certified manufacturing practices to support consistent fit and long-term service in classic engine rebuilds.

Fitment

Fits 1977-1979 Oldsmobile 98, N/A
Fits 1977-1979 Oldsmobile Custom Cruiser, N/A
Fits 1977-1979 Oldsmobile Delta 88, N/A
Fits 1977-1979 Pontiac Bonneville, N/A
Fits 1977-1979 Pontiac Catalina, N/A
Fits 1977-1979 Pontiac Firebird, N/A
Fits 1977-1978 Buick LeSabre, N/A
Fits 1977-1978 Buick Riviera, N/A
Fits 1977-1978 Oldsmobile Toronado, N/A
Fits 1977 Buick Century, N/A
Fits 1977 Oldsmobile Cutlass, N/A
Fits 1977 Oldsmobile Cutlass Salon, N/A
Fits 1977 Oldsmobile Cutlass Supreme, N/A
Fits 1977 Pontiac Grand LeMans, N/A
Fits 1977 Pontiac Grand Prix, N/A
Fits 1977 Pontiac LeMans, N/A

This part fits 39 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	Liters	Cylinders	Notes
1979	Buick	Electra	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1979	Buick	Estate Wagon	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1979	Oldsmobile	98	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1979	Oldsmobile	Custom Cruiser	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1979	Oldsmobile	Delta 88	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1979	Pontiac	Bonneville	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1979	Pontiac	Catalina	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1979	Pontiac	Firebird	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1978	Buick	Electra	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1978	Buick	Estate Wagon	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1978	Buick	LeSabre	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1978	Buick	Riviera	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1978	Oldsmobile	98	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1978	Oldsmobile	Custom Cruiser	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1978	Oldsmobile	Delta 88	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1978	Oldsmobile	Toronado	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1978	Pontiac	Bonneville	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1978	Pontiac	Catalina	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1978	Pontiac	Firebird	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1978	Pontiac	Grand Safari	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Buick	Century	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Buick	Electra	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Buick	Estate Wagon	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Buick	LeSabre	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Buick	Riviera	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Oldsmobile	98	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Oldsmobile	Custom Cruiser	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Oldsmobile	Cutlass	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Oldsmobile	Cutlass Salon	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Oldsmobile	Cutlass Supreme	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Oldsmobile	Delta 88	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Oldsmobile	Toronado	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Pontiac	Bonneville	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Pontiac	Catalina	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Pontiac	Firebird	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Pontiac	Grand LeMans	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Pontiac	Grand Prix	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Pontiac	Grand Safari	6.6L	V8	Economy engine piston ring set with durable top and second rings.
1977	Pontiac	LeMans	6.6L	V8	Economy engine piston ring set with durable top and second rings.
No rows match your filter.

Directly replaces or cross-references 9 part numbers

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

AMS Automotive — 4454Carlson — 7818Roadmax — C1710Wix — 51147378X556291556293BC1710T8320X