Keith,
Yes, they are; however, every engine setup is different. NASCAR is constantly playing with rod c-to-c, stroke and compression height. My plan would limit c/r to 10:1 MAX(current c/r is 14:1) and set a displacement limit of 400ci. No more jacking around with internal specs. As long as it doesn't exceed 400ci, the governing body wouldn't care.
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“It takes considerable knowledge just to realize the extent of your own ignorance.”
Dr. Thomas Sowell
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