I'm not that optimistic...I think on an otherwise stock LT4, you're looking at 30-40 RWHP with a proper tune. The more HP you're making on pump the more the E85 octane is going to help. On 700+ RWHP cars, it can be worth nearly 100 RWHP.'
You cannot run 100% E85 on an otherwise stock LT4 though. You're going to be maxed at 60% or less. This means mixing with pump gas at the station every fill up. Unless you want to spend some big dough on fuel mods like the new Katech/Xtreme DI setup which they were able to run 100% with just the belt driven pump and upgraded injectors, no cam fuel lobe.
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