I was replacing my 65 Riv's cable to the starter cause it was frazzled. At NAPA they sold me a 30" replacement cable. Looks like a battery cable but black. Its not insulated from the heat. (It does have the black plastic insulation). THe gauge is the same as the battery cables while the original cable was bigger. Is this big enough for my V8 or is this for 4 cylinders? It works , so far.