Got a 80s-90’s class A motorhome? WOW what an excellent product to solve the dreaded heat saturation of the Chevy 454s in most of the RVs made.I’ve been running these along with the matching heat boots and after two seasons they look and perform excellent!In 30 years of RV maintenance these are by far the best plug wires ever… I been so impressed that I have begun to replace all my vehicles wires with this brand! Had never heard of them before but so happy I found them!! Already paid for themselves!