The PowerSource Sleeveless Chevrolet Small Block Under Header HEI NS-407 set features high-temp silicone plug boots with each cylinder numbered. Stainless steel spark plug terminals connect to wire-wound suppression cores. Cylinder and distributor boots are secured with durable shrinks for improved longevity.
- Fits Small Block Chevy engine (under headers)
- 8mm gray wire
- Fits HEI style distributor
- 300 Ohms per foot
- 90° distributor boots - 90° spark plug boots