Will this gasket seal without re-torquing the manifold bolts?

New gaskets typically require proper bolt torque to seat correctly. Refer to your vehicle's service manual for the correct specification — don't skip this step or you'll risk exhaust leaks.

Do I need to clean the manifold and head surfaces before installing?

Yes. Remove any old gasket material and carbon buildup from both mounting surfaces with a gasket scraper or wire brush. A clean surface ensures the new gasket seats properly and holds pressure.

Can I reuse the header bolts or do I need new ones?

Header bolts can usually be reused if they're not stripped or damaged. Inspect them during removal — if threads are compromised or bolts are bent, replace them before installing the new gasket.