While you have the manufold off have it welded I'm pretty sure it will be cracked at the last exhaust port. I have done two of these for a neigbor he tols me they all crack in the same place. Not hard to fix with Brazing or Silversolder as i used. silver soler has better strength than brazing but cost more. Walt Davies Cooper Hollow Farm Monmouth, OR 97361 503 623-0460