[81chevys]

Well i cant tell you about your oil problem but ive seen it done on a tbi truck with a performer for vortec heads. It worked and made decent power. They used the used a spacer. No need for the gmpp

Also therebare ls setups that do get 23+mpg. They generally are not lifted but they do exist. My truck weighs 3990 with the sbc iron heads and iron intake. The ls is a hare lighter with the plastic intake and aluminum heads. I expect at least 20mpg
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