Ok so I dont know why i didnt think of this before but I looked in my part info book and for 85-86 318 pistons the comp height is listed at 1.76 so with that number it puts me .062 in the hole instead of .100 if I put that on the calculator it gives me a cr of 8.87 that's no eyebrows either. That's is not as low as I thought. A quick and easy .015 off the heads will put me over 9:1 that is very doable. Of course I really know until I pull the heads and measure my pistons and cc my heads.