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the NHRA rules for superstock is that you need to run stock bore and stroke....
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Don't know about the rest of the SS classes, but from speaking with Dave Wicks, SS/D
X is based on weight and displacement and if memory serves me right, I recall 16lbs/ci. John's car with a 207ci engine is a little lighter than Dave's running a 215ci. One other amazing thing is that the turbos are limited in size and real tiny! I believe Dave says he twists his up to 8800!