i use wallace racing`s calculator. i have my own formula to calculate dcr and both give me 7.12 or 7.13 dcr. input numbers to plug into the wallace racing calculator are bore=4.35, stroke=3.75, rod length=6.768, static cr=9.35, altitude=0, boost=0, 8cylinders and intake closing point=70*. it should give you the same results as mine. you can use their calculators they are accurate and very powerful.