First of all, Im new to this, so bare with me, one day I will have this knowledge to share. So after some reading about my smoke issues on my flathead, I decided to run a compression test. My numbers are as follows: 1- 90 2- 90 3- 80 4- 90 5- 75 6- 80 7- 90 8- 90 I understand that 3,5,6 compression is low. For the numbers that Ive read in posts, they all seem a bit low, but in range of each other. What else, if anything does this tell me about my engine? If your numbers looked like this, where would you start? My engine fires right up, and runs well, but smokes here and there under acceleration. Thanks!