Thanks Denny. When I entered these numbers to get my Dynamic cr, I got a what I thought was a bad "report card". I am 4.040 on the bore, 3.48 on the stroke, 5.7 on the rod, 10.23:1 cr, I dont know the boost number I should use and 650 on the alt. Would you like to plug those numbers in for me on that chart and see what you "thaink" about those numbers it spits out. I really trust your opinion. If you'd care not to bother I appreciate the input already given, Thanks. Jim