it seems the R07 hasn't been approved for the nns due to costs and jack roush. more important, the new restrictor plate rule seems to be an attempt to allow chevy nns teams that can afford it to use the R07 and teams that can't (or who don't have a new engine) to keep what they've got.
briefly, nascar forced toyota to build a new engine, and they did - one without any technological or financial baggage. there were no toyota teams with old engines and parts that would incur big costs by switching.
chevy built the R07 "from scratch" and had no technological baggage, but had many teams who could not afford to scrap their SB2 engines and parts and buy the more expensive R07.
ford and dodge teams have no new engines in the works and jack roush and ford fought the R07 to avoid the expense.
for more info check out my answer here: http://answers.yahoo.com/question/index;_ylt=AjvQDeBQgaoYHVt6slxY7jd3xQt.;_ylv=3?qid=20080724182015AAzng7e
do you now think the new rule is a good compromise?
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