Hello everyone, I took on the task of removing the heads on a 350 4-bolt main that came free with the free truck I am building. (Actually, I'm more like taking it apart, but making it run at the same time). My question is this..... 2 of the 8 pistons are marked as .030, and are noticably different than the other 6. Now I have been told that a .030 over 350 is actually a 355 so.... Please check my math here.... If I take the 5 extra ci gained at .030 over and divide it by 8, I get .625ci per cylinder that is .030 over. So, if I multply that times the 2 overbored holes (Cyl#1 and #3 in case it makes a difference) then I come up with a 351.25ci engine. If I figure that my suburban was rated at 165hp with the 350, and divide 165 by 350ci, I get a whopping 0.47142857142857142857142857142857 hp per ci. That means that I have gained 0.58928571428571428571428571428571 hp by having this configuration. Watch out NASCAR! I wonder how this will affect my fuel economy..... My other issue is the compression ratio on these cylinders. I understand that the bore size affects the compression ratio, so when someone asks me, should I just give them an overall average, or break it down to theoretical CR by each cylinder, or better yet, by cylinder pair? Maybe later we can discuss what kind of cam I should run to take advantage of my additional 1.25ci!