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Small Block Chevrolet Crankshaft Bearing Spacer Kit These bearing spacers from COMP Cams allow 350 Chevrolet crankshaft Installations into 400 Chevrolet blocks. Absolutely no machine work is required for Installation simply snap them in and install standard 350 bearings. You save the cost of buying thicker more expensive bearings. We have had thousands in use for over 20 years without failure.