Standard journal size crank shaft connecting rod Bearings without dowel hole and main bearings compatible with 1968 and up Chevrolet 305, 327 large Journal and 350 cid small block V-8 engines. Bearings are narrowed to accommodate large radius crankshafts. Bearing material is an alternative to the traditional tri-metal bearing construction. Bearings have an exclusive alloy of aluminum, tin, and copper on steel backing. Bearings have a single, deep layer (.012"-.015") of material that gives these bearings superior embedability. Available in Your choice of under sizes. Click the box of your particular size before adding to cart.