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Message: [QUOTE="ja_cain, post: 1257599, member: 11928"] How many miles do you have on it now? Did you do any extended idling since reassembly? Engine rpm should be varied under some kind of load (not done in park). Expansion and contraction of the metal helps in break in. If rings are plasma coated, then they could take longer to break in. I would take it someplace like a large parking lot so you can hold it in first gear and rev it out to close to redline and then let the truck compression break. Do this as much as you can after the first 100 miles. Once you have 1000 miles on it, find something moderate to tow and drive around like that as much as you can. No load driving can be bad due to deposits being formed on the walls thus inhibiting break in. Alternatively, too much load in the beginning could potentially lead to glazing. No bueno if that happens. Have an oil analysis done to look at fuel dilution. This should tell you if you are not getting good ring seal. Also, call swamps and ask them what their recommended engine break in procedure is. [/QUOTE]

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