H4YS Silver spark plugs.
M14 x 1.25 - 0.46" reach, Conical seat, 16mm hex.
Chevrolet V8 - 350 1976-91 L98 engine
Ford V8 - 302 1984-95
Ford V8 - 351 1984-95
Ford V8 - 460 1988-96
Silver is the best electrical and thermal conductor of any metal. This makes Nology Silver™ the best spark plugs in the world. Period!
- Silver Center Electrode
- Delivers the Most Powerful Spark
- Increased Horsepower
- Cleaner Combustion
- Long Lasting
- Race Proven Design
- Top Quality Materials
Nology Silver spark plugs are especially designed for high-performance engines. Silver is the best electrical and thermal conductor of any metal, which makes it the ultimate material for a spark plug's center electrode. The large diameter silver center electrode increases spark carrying ability and spark power. Silver is extremely resistant to erosion, guaranteeing a virtually unchanged electrode gap for the life of the spark plug. Most Nology Silver spark plugs are without a resistor, perfect for performance enthusiasts who demand the most from their engines.