These are good head gaskets, I usually use heavy duty ones but I don't plan on using this truck for very long. I've used Fel-Pro head gaskets many times and never had a problem. They do a great job and seal well. I got these for my 98 K1500 with 5.7 Vortec, they are sold individually not as a pair. They don't have a specific side that needs to be up, so the same gasket works on both sides of the engine. They also do not require additional sealant like some imported in-line engines.