Product Overview This is a genuine factory GM Big Block Chevy (BBC) bare engine block, casting number 3988512. This is a rare, one-year-only casting from 1970 used for the 402 CID V8. While many 1970 vehicles were badged as "396" (such as the Chevelle SS and Camaro SS), this 402 displacement was the actual factory specification. It is a highly desirable core for period-correct muscle car restorations.
Technical Specifications
Casting Number: 3988512 (The "512" block).
Production Year: 1970.
Engine Displacement: 402 Cubic Inches (6.6L).
Bore Size: 4.125 inches (Standard).
Main Configuration: 2-Bolt Main.
Country of Origin: Manufactured in the United States.
Condition & Inspection Details This block is professional-prep ready for your high-performance build. It has been serviced with the following:
Maged (Magnafluxed): Tested and confirmed to be free of cracks or structural defects.
Hot Tanked: Professionally cleaned and degreased; oil galleries and water jackets are clear of scale and sludge.
Standard Bore: The cylinders have not been bored and remain at factory standard dimensions.
Builder Note: As with any vintage high-performance core, a final finish hone or bore should be performed to match your specific pistons. This block is sold AS-IS for parts or repair.
Shipping Information
Method: Ships via Freight on a secured wooden pallet.
Total Weight: Approximately 275–300 lbs including pallet.
Preferred Carriers: Midwest regional shipping available via Panama Transfer Inc. for reliable service.
Notice: All fluids have been drained. Delivery to a commercial address with a forklift or loading dock is recommended to avoid residential liftgate fees.
California Proposition 65 Warning
⚠️ WARNING: Handling this motor vehicle part can expose you to chemicals such as lead and engine oils, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, service in a well-ventilated area and wash hands after handling. For more information, visit the official P65Warnings website.