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1970-80 Chevy 400 Narrowed Main Bearings

1970-80 Chevy 400 Narrowed Main Bearings

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 No Warranty, No Returns On Garage Sale Items

We start with a Clevite 77 # MS1038P-STD standard size main bearing and clearance chamfer cut it to fit large fillet radius cranks. Fits small block Chevy 400 c.i. crankshafts.

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Clevite H-Series Chevy 400 Main Bearings
(Part #757M1038H)
                        Clevite's H-Series was developed primarily for use in NASCAR type racing, but  they are suitable for all types of competition engines. These sets are for 1970-1980 S/B Chevy 400 c.i. V-8 engines.   
  • 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 pattern should ideally cover 2/3 to 3/4 of the bearing surface.
  • The X001 option has .001" more bearing/oil clearance
  • If you aren't sure which type of performance bearing to start with, the H-Series will be your best choice.

H-Series Features (Link)

King XP Series Chevy 400 Main Bearings
(Part #910509XP)
                        
  • Enhanced tri-metal copper lead construction with nickel barrier and SecureBond adhesion 
  • Unique SecureBond adhesion process for superior stability between the top and intermediate layers
  • 15% - 30% greater load capacity than traditional bearings
  • Mains and rods are narrowed for large radius crankshafts
  • Greater rod bearing height improves bearing-to-bore contact/heat transfer and reduces spin potential at high RPM
  • 0.0005" metallurgically enhanced and hardened performance overlay withstands greater loads and better resists surface fatigue
  • Mains are 1/2 grooved for uncompromised lower shell load capacity
King HP Series Chevy 400 Main Bearings
(Part #910509HP)
                        
  • Bi-metal aluminum silicon alloy featuring fine micro-bore finish
  • Mains and rods are narrowed for large radius crankshafts
  • Mains are 3/4 grooved for improved oiling to the rod journals
  • Greater rod bearing height improves bearing-to-bore contact/heat transfer and reduces spin potential at high RPM
  • 0.015" thick top layer for superior macro particle embedability and conformability
  • 40 Vickers hardness to resist overlay migration and extrusion
  • 450°F heat threshold for superior protection against friction and overheating