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My opinion is, if you are only going to have LT4 fuel parts with a cam lobe, running E85, then you will not be able to run enough boost to justify lowering the compression ratio (due to limited fuel supply). Lowering the compression ratio actually makes the engine less efficient, and you'd need to then up the boost just to get back to where you are right now. So unless you are doing a setup to run quite a bit of boost, I think that lowering the CR would be a step backwards. Therefore, with the parts and fuel that you're listing, I think that the drop-in pistons from Vengeance Racing (stock CR) would be a better choice than the lowered-CR pistons.
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