Ford Clevite CB634HN Connecting Rod Bearings
Part #: CB634HN
List Price: $18.40
Our Price: $11.26
You Save: $7.14
Availability: In Stock
Ford Clevite H-Series 77, Tri-Metal Connecting Rod Bearings fit the following:
221 CID 3.6L V8 cylinder 1962-1963 (High Performance),
255 CID 4.2L V8 cylinder 1980-1982 (High Performance),
260 CID 4.3L V8 cylinder 1962-1965 (High Performance),
289 CID 4.7L V8 cylinder 1963-1968 (High Performance),
302 CID 5.0L V8 cylinder 1968-2001 (High Performance).
NOTE ALL: H-Series Performance, Narrowed On One Side For Increased Crank Fillet Clearance, No Dowel Hole In Cap Half.
Clevite HN-series bearings will be narrowed in place of the enlarged chamber to provide greater crankshaft fillet clearance. The new narrowed bearings will be available with a “HN” suffix.
Clevite Connecting Rod Bearing part number: CB634HN (Standard)
These bearings are identified by a letter H in the part number suffix. Part numbering is based on the same core number as the standard passenger car parts for the same application. These bearings were developed primarily for use in NASCAR type racing, but are suitable for all types of competition engines.
H series bearings have a medium level of eccentricity, high crush, and rod bearings have a hardened steel back and thin overlay. These bearings also have enlarged chambers for greater crankshaft fillet clearance and are made without flash plating for better seating. Bearings with .001” extra clearance are available for standard size shafts and carry the suffix HX” (X = extra clearance). Rod bearings are available with or without dowel holes (HD = with, H = without), main bearings are available with standard 180 degrees upper half grooving and with full 360 degrees grooving (H = 180 degrees, HG 360 degrees). Use H series bearings with crankshafts that have oversize fillets and where engines run in the medium to high RPM range. H series bearings should be used if contact patterns obtained with P series parts are too narrow. Contact patterns should ideally cover 2/3 to 3/4 of the bearing surface. See accompanying contact pattern diagrams. If you aren’t sure which type of performance bearing to start with, the H series bearing will be your best choice.
*Part of a combination interchange requiring multiple parts competitor partsWhen 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.