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

The gasket alone will seal with factory bolts if they're in good condition and torqued evenly. If bolts are corroded, stripped, or haven't been touched in years, replacing them during this job prevents leaks from creeping back in.

Should I clean the manifold and head surfaces before installation?

Yes. Scrape off old gasket material and carbon buildup with a gasket scraper or soft wire brush, then wipe clean with a rag. A clean sealing surface is non-negotiable—rough surfaces or debris kill the seal immediately.

What torque spec should I use?

Refer to your vehicle's service manual for the exact torque and tightening sequence. Uneven torque or over-torquing crushes the gasket and causes leaks; follow the sequence step-by-step to get it right the first time.