[19bonestock88]

I read somewhere that they actually made a high compression D17 from the factory, but was meant for CNG...

Were I wanting higher compression, I’d just do the pistons. While there is a shorter stroke crankshaft for my engine, it doesn’t bolt to my stock flywheel... my main reasoning for wanting high compression and E47 is to make more power, on slightly cheaper fuel... some tuners say that you get *most of* the benefit of running ethanol at E47 and it doesn’t have quite the same trouble with cold starts as E85, and (big surprise) it gets better mileage than E85... I imagin that with an engine optimized for the fuel, E47 could out-do regular unleaded on all fronts...