Do I need new bolts when I install this?

The gasket alone replaces what you remove. Check your existing header bolts for corrosion or damage — if they spin freely or won't tighten down, swap them out. Most jobs reuse the originals.

Should I clean or prep the mounting surfaces before installation?

Yes. Wipe both the header flange and manifold face clean with a rag to remove carbon buildup and oil. A smooth, dry surface lets the gasket seat properly and prevents leaks.

What torque spec should I use when bolting it down?

Refer to your vehicle's service manual for the exact torque specification. Tighten in a crisscross pattern to ensure even compression across the gasket.