LA360 compression

Dan the man said
I used the NGK compression calculator and with kb107 pistons 0.012" below the deck and 68cc heads,0.039" thick headgasket with pistons having 5cc valve reliefs and a 4.030" bore stock stroke, I got a compression ratio of 9.90:1. I don't know how your machine shop came up with 8.0:1
Click to expand...
@Dan the man , because it's been decided that they are not KB107's like I was told. They might be KB's, but they are a flat top piston and have no reliefs like the 107's. They are definitely sitting about .100 below deck. The above pic of the orange block is mine.