My goal is to run upwards of 14:1 cr with as close to a flat top piston as possible. It shouldn't be too hard with a 4.560 bore and a 4.625 stroke. Once the heads are done, I'll see how much they can be milled to get the proper chamber cc's to run a flat top. I remember the MTBE additives from years ago. They (Ecology Police) finally figured out that while trying to save the birds and the frogs, they were causing cancer to us mere mortal humans. I'm thinking of starting out with VP M1, and maybe switch over to M3 once I get a handle on how methanol works.