Made in USA
R40858-030 Piston Ring Set for 1970-1991 Jeep, American Motors 5.9L [+0.030 in. Oversize]
InfoVehicle Info Needed
ENGINETECHPART NUMBER: 416-R40858-030

R40858-030 Piston Ring Set for 1970-1991 Jeep, American Motors 5.9L [+0.030 in. Oversize]

$5399
ShippingShips Tomorrow
Lowest PriceLowest Price Guarantee

Items You Need

Engine Assembly Lube [4 oz. Bottle]

JEGS

Engine Assembly Lube [4 oz. Bottle]

Part Number : 555-28000
$599$6.99
You Save$1.00
1-Ton Automotive Shop Crane [Boom Operating Range: 34 in. to 45 in.]

JEGS

1-Ton Automotive Shop Crane [Boom Operating Range: 34 in. to 45 in.]

Part Number : 555-81044K
$23698
123-Piece Tool Set with Carry Case

JEGS

123-Piece Tool Set with Carry Case

Part Number : 555-80427
$3999$51.99
You Save$12.00
Rotating Engine Stand [1000 lb. Capacity]

JEGS

Rotating Engine Stand [1000 lb. Capacity]

Part Number : 555-80059
$32999$362.99
You Save$33.00

Chrysler/Dodge/Jeep
Piston Ring Set
  • 1970-1991 Jeep, American Motors 5.9L
  • Standard Ring Set
  • Size: +0.030 in. Oversize
  • Sold as a Set

    The Enginetech R40858-030 is a piston ring set for 1970-1991 Jeep, American Motors 5.9L. 5/64 5/64 3/16 engines at +0.030 in. Oversize oversize. Ring set is engineered for proper cylinder sealing and oil control.

    Enginetech R40858-030 Piston Ring Set Features:

    • Fitment: AMC/Jeep, 360 ci
    • Size: +0.030 in. Oversize
    • Engineered to OE specifications for direct replacement
    • Precision Sealing Solutions for Consistent Engine Performance

      Enginetech Piston Ring Sets are engineered to deliver reliable sealing, efficient combustion, and long-term durability across a wide range of engine rebuild and performance applications, backed by Enginetech’s reputation as a trusted supplier to professional engine builders. Manufactured in OE-certified facilities using high-quality materials such as gray iron, ductile iron, and high-strength steel, these rings are designed to maintain proper compression, control oil consumption, and withstand demanding operating conditions. Designed for precise fitment and consistent end-gap tolerances, Enginetech ring sets support optimal cylinder sealing and reduced friction, helping improve engine efficiency and longevity. With broad coverage for domestic and import engines and multiple configurations to match specific build requirements, Enginetech piston ring sets provide a dependable foundation for rebuilds, repairs, and performance upgrades.

    Part TypePiston Ring Set
    Product LineEnginetech Piston Ring Sets
    BrandENGINETECH
    Package Height2.0
    Package Width5.0
    Package Length10.0
    Weight1.25 PG
    Part CategoryReplacement Parts
    GaplessNo
    Second Compression Ring Thickness5/64
    Size+0.030 in. Oversize
    Top Compression Ring Thickness5/64
    File FitNo
    Top Ring MaterialStandard
    QuantitySold as a set
    Oil Ring Thickness3/16
    FitmentAMC/Jeep
    Part FitmentDirect Fit
    Ring Outside Diameter4.080
    Vendor Part NumberR40858-030
    Package Qty1
    Package TypeEA
    Some parts are not legal for use in California or other states with similar laws / regulations
    p65 warning