Yea, I didn't mean to come off as bashing Canton. I've had several good ones too, but the 50/50 chance got kind of old. About 15 years ago, I looked for a better way to make the aluminum pans fit better. I put one in the oven we used to bake blocks and heads before blasting them and heated it to 500* for about an hour. Then I pulled it out of the oven and immediately bolted it to the block and let it sit overnight. The 1/2" rock that it had right out of the box had reduced to less than a 1/8". I've been doing it that way ever since.89 foxbody, factory k-member, manual rack, 351w (408ci) factory block using an aluminum canton pan front and back sump, its a 7qt pan plus filter, no problems to this day, just pilled it out of the box and bolt it right up.