HEMI Technical Info

You are here

Home » Racing Hemi - Tech » Hemi Race Engine

Engine Bearings - Big Block Mopar

  Bearing Failure Information
Rod Bearings.

use a standard 2.375 journal size for all big block engines, all years, with stock or aftermarket rods.
Big Block Chevy (2.200 journal diameter) bearings are sometimes used with stroker crankshafts which have the 2.200 size rod journals.
Rod Bearings
Part#: Size: Series: Material: Fillet Clearance:
P Series:
CB-527P-10 -.010 P TM-77 NO
H Series:
CB-527HD STD H TM-77 YES
CB-527HD-1 -.001 H TM-77 YES
CB-743HN(Big Block Chevy) STD (2.200) H TM-77 YES (1)
7300SHA Std -1-2-3-10 and +1 M Bronze Babbit
Nickel
YES
TRI ARMOR: The */K series bearings are Clevite's new Tri Armor series with their proprietary
PFTE moly/graphite friction reducing coating.
CB-527HDK STD H TRI- ARMOR YES
CR806HPND  -  and XP (coated)     Bi Metal YES
M Series: Micro babbit
CB-1512M ( L-lower/U-upper )   M Micro babbit YES
V Series
CB-1512V ( L-lower/U-upper )   V   YES
Footnote (1): These bearings are clearanced for oversized journal fillets, however instead of having a 45 degree champher cut into the edge of the bearing,
the entire outside edge of the bearing is narrowed slightly. This makes the bearing itself slightly narrower when compared side by side to a standard
width bearing (such as a CB-527P,) even though you will not see a 45 degree champher or beveled cut into the edge of the bearing.

 Main Bearings.

RB - 2.750" , B - 2.625
1958 up until the 1973 ,the diameter of the thrust surface's is 3.470-B , 3.600 - RB engine.
1974 the diameter of the thrust surface's is 3.750 - B engine, 3.880 - RB .
 1, 2, 4 & 5 are the same for all years.
Some Racing cranks and blocks use 3" Mains, and these require a separate thrust bearing (Kit - 4 pieces), there is 2 different kits :
Aluminum (aftermarket ) =
Stock blocks that have been align bored to 3" =

In the Oil Groove column below, FULL indicates that the oil groove forms a complete 360 degree circle around the bearing, while HALF indicates the groove is in the upper half of the bearing only. These are followed by the approximate width of the groove. Occasionally the degree of beveling used by Clevite for cutting the groove will vary among different production runs, so these numbers are an approximate guideline only, not accurate to the thousandth.
B (361/383/400) Early Main Bearings
Part #: Size: Series: Material: Recommended Clearance: Oversized Fillet Chamfer: Oil Groove:
MS-876-P STD P TM-77 0.0011-0.0036 NO Full .100
RB (413/426/440) Early Main Bearings
Part#: Size: Series: Material: Recommended Clearance: Oversized Fillet Chamfer: Oil Groove Details:
Full Groove Sets
MS-877P-10 -.010 P TM-77 0.0011-0.0036 NO Full .100
MS-1795V STD V VP-3 0.0005-0.0026 YES Half .150

 

Hemi Racing Main Bearings
Part #: Size: Series: Material: Clearance: Oversized Fillet Chamfer: Oil Groove:
MB-3248V( L-lower/U-upper ) 2.750       YES  
MB-3248V( L-lower/U-upper ) 2.750       YES  
MS-1795-V ( L-lower/U-upper ) 2.750 V Lead indium   YES  
MS-1795-M ( L-lower/U-upper ) 2.750 M Micro babbit   YES  
MS-2067V ( L-lower/U-upper ) 3 V Lead indium 0.0011-0.0036 YES Full .100
TW-120S side thrust bearings for 3 crankshaft Note: are separate

 Types of Materials
P series:
are the original staple bearing. Recommended for stock rebuilds up to medium performance use, these tri metal bearings are made from TM-77 material. They start with a hardened steel back for strength and support. Over that is a cast copper lead lining to provide the durability and support to withstand the loads of engine operation. Then a nickel plating is applied to prevent interaction between the copper lead and the final layer, a strong, extra thin (.001 or less) electroplated overlay of babbitt. Babbitt is a tin or lead based alloy with varying amounts of antimony, copper or arsenic which is designed to resist flaking and is very soft by nature. This helps to give the bearing embedability (the ability for stray particles to be absorbed by the bearing so they don't rip the crank journal to shreds), conformability (the ability of the bearing to conform or adapt to any out of spec surfaces or distortion) and resistance to both seizure and corrosion while still withstanding the high loads a performance engine can generate. Finally they are flash plated with a lead/tin mixture to help protect them and mostly make them look better, (yes this step is mostly cosmetic.) These bearings have high crush for better retention and their high eccentricity helps to accommodate any housing bore distortion. These are a good quality line of bearings, however if you are building an engine that is highly modified, such as aftermarket cylinder heads, etc, you will probably want to think about upgrading to one of the performance bearings listed below. P series are not clearanced for aftermarket cranks with larger crankshaft fillets, although they will usually still work correctly, and any competent shop should be able to easily perform this operation to them if needed.

H Series:
Originally developed for Nascar racing, H series are made of the same TM-77 material as the P series, and include most of the features described above, however they are not flash plated with the lead/tin apparently in an effort to help them seat better. They also have enlarged chamfers to help them clear bigger crankshaft fillets. In rod bearings, these are available in .001 oversize, standard (.000) and .001 undersize, making them an ideal choice for those who want more flexibility in setting their clearances. They also have a medium level of eccentricity. A good overall performance bearing, especially if you need the precision sizes.

K Series:
Part numbering is based on the same core number as the high performance part and will service the same application. These bearings were developed primarily for high performance applications and all types of competition engines. K-Series bearings have a proprietary moly/graphite treatment applied to the bearings surface, but not the bearing parting lines. The PTFE carrier material gives good low load start-up protection. The moly serves as a high pressure, high load dry film anti-wear agent. Graphite provides additional protection across the broad range of temperatures, especially when oil flow is marginal and is especially slippery with an oil film. These bearings, which are also referred to as TriArmor, still offer the strength and durability of the legendary Clevite TriMetal bearing construction coupled with the latest in coating technology.

M Series:
M stands for Micro Babbitt, and these bearings are made of Clevite's B-2 material. This consists of a hardened steel backing, to which a .006 thick layer of babitt material is bonded. Because babbitt is very soft, these bearings have an outstanding level of conformability, (the ability of the bearing to conform or adapt to any out of spec surfaces or distortion) for applications where the crankshaft may be subjected to severe deflection under load. However, the downside of this is that the life of these bearings can be very short, and these are generally considered a race only item. Although some engine builders are familiar with and prefer this style of bearing, it is generally accepted that the V series will do just as good a job without the short lifespan, making the M series in our opinion, not the best choice for all but the most specialized of applications.

V Series:
The V series were originally manufactured by the Vandervell company in England, Clevite bought Vandervell and is now distributing their bearings under the Clevite name as the V series. We feel the V series are a great choice for performance bearings. V series have found their way into nearly every form of motorsports with virtually no problems. Nearly 100% of 8000+ horsepower top fuel drag racing teams use them. They are almost universally used in Pro Stock and Winston Cup. Cosworth Formula one engines that turn 11,000 RPM for extended periods of time use them with great success. These bearings are still a tri metal bearing, however they use a lead indium overlay instead of the babitt in the above bearings. Lead Indium has amazing properties. It has a super low surface friction coefficient or lubricity, meaning wear at startup before the engine can develop oil pressure is greatly reduced. It can withstand and operate at higher temperatures for longer periods of time. It will resist flaking and peeling under extreme loads better than any other bearing. It has the highest resistance to corrosion of any bearing material, and it does all this while still having unsurpassed properties of embeddability, conformability and fatigue strength. And the best part is just because these perform so exceptionally in a racing environment, there is no reason they can't be used with equal success in a street car or in milder performance engines as well. These have a low to medium level of eccentricity, and also are usually narrowed to help them clear bigger crankshaft fillets. .