Final calculation said an increase of from 15.1 to 15.5 on compression if i keep the unswept volumes the same. If it gets to be more for some reason i can cut the dome down, which currently is about .100 hi and flat. I redid calculations by stroke increase and also by cubic inch increase and came up with slightly higher numbers of 15.7 and 15.73. The originaI compression was calculated way back in 2002 when i put it together for the first time. I don't want to go above 15.5 on advice of a very well known engine builder who said 15.25 to 15.5 was about the best place to be. Higher than that needed more fuel to keep the motor happy which cancels any extra power.
