If you order G-Body body mount bolts from GM today, the Electronic Parts Catalog (EPC), for example, Position three, you will receive a M10X1.5X80. Further investigation in the GM Standard Parts Catalog for this fastener indicates the fastener (bolt) will be 10.9 hardness
As stated, and supported by GM Service Information, published torques are dry unless otherwise stated.
Service Manual | General Information | Cautions and Notices | Introduction |
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Fastener Notice
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Not disputing the point, but which manual is that from? I have three GM shop manuals, '83 Chevy plus '83 and '84 Buick, and I don't see that in any of them. (If I'd seen that, it would have saved a lot of blather.)
I highly doubt only 4 of them are bad. Like many people have said before they can look just fine and actually be bad. Even if there was just four of them bad, you would most likely damage all the other ones that are good while replacing the 4 bad ones.
In answer to your original question, I could be wrong, but the local Chevy dealership might sell them individually. I would say that is your best bet.
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