Going to try and get my Chevy 235 fired up this week and was having a look over the motor before I do so. I noticed something strange. Stock oil filter is in there, but bypassed for some reason? There is a line that comes out of the block, then just goes right back into it...bypassing the filter completely for some reason. Also in this line is a "T" with a line going up to a hole in the top of the head, dead center for some reason...any ideas before I fire it up?