want to build new motor

Ocean Shores? not many or any tracks near you. Did you hear they ran a race in Shelton a month or so back. Ever race your Demon at any of the old tracks like Arlington, Puyallup or Deer Park? It's a shame tracks aren't everywere like they used to be.
Rumblefish360's advise is pretty solid on the head thing. The stock heads can only do so much. My X's are running low 11's with a stock stroke 340 but I know they are holding me back.