This billet valve cover requires a touch longer spark plug wire than factory. You can purchase our 10mm wires with high temp heat sleeve. Our spark plug wires are available in black or red. You can also purchase MSD truck length plug wires for LS engines if you prefer an MSD wire. Want your valve covers to have a custom logo of your choice? Send us your artwork or idea to firstname.lastname@example.org and we can give you a quote.