We use these in our performance packages! Copper has great spark but doesn't last as long. Amazing upgrade in a camshaft package!Copper Resistor; Pre-Set Gap: 0.044"
Since 1936, Autolite has been a trusted leader and innovator in spark plug technology. You can count on Autolite copper plugs for performance and value, backed by decades of experience and passion.
 
Features & Benefits:
Guaranteed to deliver quick starts, good fuel economy and smooth acceleration.
Copper core center electrode for higher thermal conductivity
Specially engineered high nickel alloy center and ground electrode for extended life
High alumina ceramic for high dielectric strength
Leak proof, heat fused internal seal for durability
Multi-rib insulator prevents flash-over
 
This spark plug is pre-gapped, but may require minor adjustments with a spark plug gapper, must check specifications. For proper engine performance, gaps should be within ±0.004" of OE-Recommended value.