Do I need to replace the header bolts when I install this gasket?

Not necessarily. Clean your existing bolts and inspect them for corrosion or stripping. If they're in good condition, reuse them. If threads are compromised or bolts are rusted solid, source a stainless hardware kit rated for exhaust work to avoid future leaks.

Should I prep the gasket surface before installation?

Yes. Use a gasket scraper to remove all old material from both the header flange and cylinder head. Wipe the surfaces clean with brake cleaner and let them dry completely. Don't apply sealant—aluminum gaskets seal mechanically through clamping force.

How tight should I torque the header bolts?

Refer to your vehicle's service manual for the correct torque specification and sequence. Uneven tightening causes gasket failure. Tighten in a star or cross pattern, then let the engine cool fully before doing a final check.