Just a thought, but I would also check out using one of the high torque starters, like Hitachi or Proform, both of which I have used. Even if your engine is not high compression ratio, these high torquers are gear driven, which really whip the engine over zero weather at the same CCA as you would use for a normal starter. The only drawback is that they are more expensive than factory, but I think they are well worth the expense for reliable cold weather starts.
