If you are going to have it torn apart anyway, then I say go for it. I don't think you will really notice any difference in everyday driving, but that doesn't mean there is NO difference. It all starts adding up in the end, even if we can't tell where its coming from.
I've been following your posts on your Blazer with interest because I just bought a '83 ford f250 idi 6.9L diesel myself. The guy who owned it before me was averaging low 20's, and I'd like to use some of your mods to get it into the high 20's or low 30's. If that's possible, I could get rid of 2 other trucks and have this beast take its place.
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