Clevite Cam Bearing GM 348 5.7L 1958-1961 HP STD.

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Description
Brand: Clevite
Part Number: SH398S
Condition: New
Sold As: Individual

General Motors Clevite B-1, Bi-Metal Cam Bearing Set fits the following:
348 CID 5.7L Chevrolet V8 cylinder 1958-1961 (High Performance),
409 CID 6.7L Chevrolet V8 cylinder 1961-1965 (High Performance),
348 CID 5.7L Chevrolet V8 cylinder 1958-1965,
409 CID 6.7L Chevrolet V8 cylinder 1961-1965.

Clevite B-1 Cam Bearings are B-60 Steel backed bearing with a conventional babbit lining

Clevite Cam Bearing Set part number: SH398S (Standard)

The first commonly used bearing material was an alloy of lead, tin, antimony and arsenic called “Babbitt” which was named after its inventor. Babbitt has physical properties similar to solder. It’s soft which allows it to conform to minor imperfections in geometry and alignment of mating parts. This softness also allows Babbitt to absorb dirt and wear particles that might pass through the bearings clearance space. Babbitt is also very slippery which minimizes friction in the absence of oil during startup.

Although Babbitt is the best bearing material based on its surface behavior, it has one serious shortcoming. By itself, in thick layers, Babbitt cannot carry high loads for long periods. Under the repeated cyclic loading of an internal combustion engine Babbitt will break up and flake out. This reaction to cyclic loading is called “Fatigue.” Bearings are typically constructed with a steel backing to provide support and allow the bearing shells to be an interference fit with their housing.

The earliest insert bearings were Bi-metal construction with a lining of Babbitt. As mentioned above, although Babbitt offered optimum surface behavior, it lacked fatigue strength. It was found however, that the fatigue strength of Babbitt could be significantly improved by reducing its thicknes.

Clevite B-1 Cam Bi-metal “MICRO BABBITT” bearings use a thinner layer of Babbitt lining to provide better fatigue resistance, and Tri-metal bearings which use an extremely thin electroplated overlay layer of Babbitt over a stronger intermediate layer to combine the surface properties of Babbitt with the greater fatigue strength of the intermediate layer. An alloy of Copper, Lead and Tin is the most commonly used intermediate layer.

Original Equipment bearings have employed all of the popular types of materials and construction over the years. Bi-metal Babbitt, Bi-metal Copper- Lead, and Bi-metal Aluminum, have all been used at various times in numerous applications.

Installation of bearings into the block must be done with care to avoid shaving metal off the backs of the bearings. This galling action may cause a build-up of metal between the bearing OD and the housing bore which will result in a reduction in clearance. To prevent galling, check housing bores for a proper 25 to 30 degree lead-in chamfer before installing cam bearings. On blocks without grooves behind the cam bearings, care must be taken to insure that oil holes line up between the bearings and block. Where the block has a groove behind the bearing, the bearing should be installed with the oil hole at the 2 o’clock position when viewed from the front for normal clockwise camshaft rotation. This will introduce oil into the clearance space outside of the loaded area and allow shaft rotation to build an oil film ahead of the load.

Component No. SH-398 SH-399 SH-400 SH-401

Positions 1 2 3-4 5

Material B-1 B-1 B-1 B-1

Min. Std. Shaft Diameter 1.8682"
47.4523mm 1.8682"
47.4523mm 1.8682"
47.4523mm 1.8682"
47.4523mm

Max. Std. Shaft Diameter 1.8692"
47.4777mm 1.8692"
47.4777mm 1.8692"
47.4777mm 1.8692"
47.4777mm

Min. Vert. Oil Clearance 0.0010"
0.0254mm 0.0010"
0.0254mm 0.0005"
0.0127mm 0.0010"
0.0254mm

Max. Vert. Oil Clearance 0.0052"
0.1321mm 0.0052"
0.1321mm 0.0050"
0.1270mm 0.0052"
0.1321mm

Max. Wall 0.0744"
1.8898mm 0.0694"
1.7628mm 0.0647"
1.6434mm 0.0694"
1.7628mm

Min. Brg. O.D. or Housing Bore 2.0190"
51.2826mm 2.0090"
51.0286mm 1.9990"
50.7746mm 2.0090"
51.0286mm

Max. Brg. O.D. or Housing Bore 2.0210"
51.3334mm 2.0110"
51.0794mm 2.0010"
50.8254mm 2.0110"
51.0794mm

Max. Length 0.8650"
21.9710mm 0.8650"
21.9710mm 0.8700"
22.0980mm 0.9450"
24.0030mm

Competitor Interchanges

Qty

Comp Qty

Comp Part No.

Comp Name

CH-5

DURA BOND

CS542BB

KING

CBS106

MCQUAY-NORRIS INC.

903CS

MICHIGAN ENGINE BEARINGS

1177M

SEALED POWER

CH5

VANDERVELL AMERICA INC

*Part of a combination interchange requiring multiple parts competitor parts

When installing any bearing
DO NOT ATTEMPT TO POLISH THE BEARING RUNNING SURFACE WITH ANY TYPE OF ABRASIVE PAD OR PAPER.
Bearing overlay layers are extremely soft and thin, typically .0005” on high performance parts.
These thin layers can easily be damaged or removed by abrasive media. Because the overlay layer is electroplated,
it may exhibit microscopic plating nodules that make it feel slightly rough.
The nodules are the same material as the rest of the plated layer and will quickly be flattened by the shaft.

This Part Fits The Following Vehicles

Year Make Model Engine Fit Note
1961 - 1958 Chevrolet Bel Air 5.7L V8 348ci
1965 - 1961 Chevrolet Bel Air 6.7L V8 409ci
1961 - 1958 Chevrolet Biscayne 5.7L V8 348ci
1965 - 1961 Chevrolet Biscayne 6.7L V8 409ci
1960 - 1960 Chevrolet Biscayne Fleetmaster 5.7L V8 348ci
1958 - 1958 Chevrolet Del Ray 5.7L V8 348ci
1961 - 1959 Chevrolet Impala 5.7L V8 348ci
1965 - 1961 Chevrolet Impala 6.7L V8 409ci
1965 - 1964 Chevrolet Impala SS 6.7L V8 409ci



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