Jeff If you are not VERY motor experienced than I would stick to the basic 2700 cc or 164 CID Corvair and be able to count on the reliability. If you don't have a very good reason for building the extra power in (i.e. heavy plane 750# or better empty etc...) than the basic 164 will be just fine. If you really want more out of it, I would add a PSRU on the front before going through what Mark went through to get 3100 cc. You make it so that there are so many small details that can go wrong that will ruin all your hard work, and if you really need the performance, I personally believe you will shorten the life of the Corvair by asking it to give you more. Basic rule of drag racing, higher revs, run harder, shorter life.
Another option is to wait until WW finished the evals on the new turbo install and copy that. That will allow you to use the basic engine and get the extra from the addition of the turbo. Just my opinion.... Colin KSFB
