I've been looking at pictures of the hoses and didn't notice any interference. I still have just a bare frame yet. Is there a picture of the subframe bolt somewhere that would show me the interference? Thanks for pointing this out, that's why I asked
The bolt head isn't flush, but it does occupy less space than a hex head would. Also less edges to rub against the hose.Is the assumption the bolt head will be flush with the bottom of the subframe? I believe at least one person who has assembled the subframe using the supplied carriage bolt has stated it does not fit all the way into the sleeved hole? If this is the case, there may be less clearance than a standard hex head bolt. Careful test fitting is required to check this measurement before committing to a mod that would be very difficult to reverse.
The only problem I see is that the welded hose barb will sit directly under the subframe bolt. You will either need to use Ross's idea so the bolt goes in from the top, or you will need to make the barb removable.I just purchased a piece of 1" black pipe and I plan to machine hose barbs with a lathe that will be welded in place. The pipe OD is .010" or so larger than the tube ID so not much needs to be removed. I thought I'd turn down just enough of the pipe to insert 1/2" into the tube. I'll then machine a suitable barb to fit the hose on the other end of the piece of pipe. Before I move ahead with this, does anyone see any problems I'm overlooking?