Do I need to clean the gasket seating surfaces before installation?

Yes. Remove any carbon buildup or old gasket material from both the cylinder head and header flange with a gasket scraper or wire brush. A clean, flat surface ensures proper sealing.

Will this gasket work if my header has been welded or modified?

This gasket is engineered for factory-spec mounting surfaces. If your header has been welded or altered, test-fit first to confirm the gasket sits flush against both surfaces without gaps or compression.

What torque spec should I use when bolting the header back down?

Refer to your vehicle service manual for the correct fastener torque sequence. Over-tightening aluminum gaskets can cause creep; follow OEM spec exactly.