what size to cut for 2 inch finish bow tie and churn dash blocks

Wouldn't it be 2 1/2? That would give you a quarter inch on each side.

Are you paper piecing? I would think the pieces would be 2 1/2" if you are doing standard cutting pieces. On a mini quilt be sure to make your seam allowances closer to 1/8". Each of your unfinished pieces would need to measure 1 1/4". So each hst would need to be 1 1/4" for the bow tie. For the Churn dash you squares and hst would need to be 3/4". It has been many years since I made a mini quilts, the girls were young. I still have all my Mini Quilting magazines. I hope I got the sizes right. You may want to convert to paper piecing for these small blocks. I actually found it much easier.

thanks for the info, will try this

Tulip43 ... This is where graph paper can come to the rescue
when one wants to downsize, or upsize a quilt block.

Draw out what you want your end result to be, and you will know!
Just be sure to remember to add your 1/4" seam allowances for each piece.

I agree with "QuiltE". I get out my graph paper and draw out the block. Always add your 1/4" to your finished drawn pattern. I didn't do that once and had a very small block. Oh well-back to the drawing board (graph paper) for me.