Do I need new bolts to install this gasket?

You can reuse your factory header bolts if they're in good condition. If bolts are rusted, stripped, or corroded, grab a new set rated for exhaust manifold temps — that's where most leaks come back from.

Should I clean the sealing surfaces before installation?

Yes. Scrape off any old gasket material or carbon buildup from the cylinder head and header flanges. A clean, flat surface is what seals — not the gasket alone.

Can I reuse this gasket if I pull the header back off?

No. Once compressed and heated, these gaskets can't seal a second time. Plan for one-time use — buy a fresh gasket if you need to remove the header again.