I've changed to a top mount turbo set up, and replacing all the oil feed/drain lines with braided hoses and AN fittings. I also want to replace the oil drain tube on the block that connects to the turbo drain line with a 10AN fitting. The weather hasn't been very cooperative the past couple weeks so I haven't been able to check out the drain tube to see how it's connected to the block. Has anyone replaced this drain tube before? If so, how does it come off and what size thread does it use? Any help would be greatly appriciated.