Product Summary

350, 4.000" Bore Size, 350 mains Main Journal Style

  • Cast-iron 4-bolt block
  • 4.000 inch bore
  • Machined for hydraulic roller or flat tappets

Key Specs

MFG. Part #10105123
BrandChevrolet Performance Parts

Need To Know

Truck Ship

Truck shipments must be pre-paid with a credit card, certified check or money order

Quick and Easy Returns

Return Policy


Production-Based Blocks

When building a performance engine or replacing a stock engine, our production-based blocks offer the strength, accuracy, and peace of mind you’d expect from Chevrolet Performance.

350 Bare Block Tech Specs

  • Engine Type: Chevy Small-Block V8
  • Displacement (cu. in.): 350
  • Bore (in.): 4.000
  • Block: Cast-iron with 4-bolt main caps
  • Rear Main: 1 Piece
  • Deck Height (in.):  9.025

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.


MFG. Part #10105123
BrandChevrolet Performance Parts
Bore Size4.000"
Main Journal Style350 mains
Deck Height9.025"
Rear Main Seal Style1-piece
Material TypeCast Iron
Cylinder WallWet
Sold in QuantityEach
Freeze Plugs IncludedYes
Cam Bearings IncludedYes
Weight181 lbs.
Finished Cylinder BoresYes
Main Bearings IncludedNo
Main Bolt Style4-Bolt
Main Cap Fasteners IncludedYes
Main Cap MaterialCast Iron
Main Caps IncludedYes