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The zl1 guys are mid 600whp range on stock lt4 pump/injectors on e85, but I'm not sure how many of them are doing that on stock fuel pump lobe. I'd be willing to bet though that you could hit "600whp" on a dynojet on stock lt4 stuff without the lobe. This is a good question to ask your tuner.
Another thing to remember is that you get most of your benefits from ethanol running like 50% ethanol. So that can tremendously extend the hp of your fuel system. Another thing to keep in mind is that you can also add pure meth ontop if you really need to extend power a bit further/give a bit fatter mixture for safety.
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