Not all, but a large majority are E-450s with 2v 6.8l v10, the early ones (97-00) had quite a few plugs "blow out", not much of a problem anymore. We also have GMC Savannah 3500's, early ones have 4.8l, newer ones have 6.0l. F650's have 6.8l 3v, we change them... Login to read more.