Corvair engine swap, Tell me why this isn't popular Options

[914rat]

I saw a car in the classifieds that has a Corvair 6 engine swap with the engine set up to run in the correct dirrection.I was wondering why we don't see this conversion very often.Seems like a pretty straight forward conversion.
http://www.914world.com/bbs2/index.php?showtopic=114974

[Dr Evil]

I have 140, tri ported heads that are going on my engine. I got them for $1500 shipped. These are rebuilt, no core needed. Try that with a 911. They came with the manifolds as well, and a holley carb adapter that I dont even need.

The heads are the limiting factor. The engines after 64 are all 2.7L displacement. The 110hp had smaller valves, the 140 larger. They dropped valve seats like 2.0 TIV did. There is a proper way to install valve seats, and staking is part of the procedure.

My set up uses 94mm p/c from a TI VW. This is a modification that can cost about $1700 at a machine shop + parts. This is not what I paid, I was looking for "less" than a 911 engine. This also yielded a 3.1L engine. If I would have stayed stock p/c the cost would have been significantly less.....but where is the fun in that.