I've made an aluminum intake manifold adapter plate for my 70 DT1C.  It will allow putting a spigot mount Mikuni VM/TM 32-34 carb on the bike. Do the intake manifold studs thread into the cylinder or are the pressed in? I need to replace them with M8 x 50mm flat head screws. Planned technique-double(or triple) nut the stud then heat/penetrantat the cylinder.  Anyone else done this?  This is a good, 1st OS cylinder, don't want to make more work.  Thanks 

Threaded, and Mikuni makes a flange adapter to convert to spigot carb.  Just need to know the stud spacing to get the right one.

Thanks Mark. I have found/purchased manifolds with 60mm bolt spacing but the mount holes are for M6 allen head screws. When bored out for M8, there is no room for a nut/washer. Have considered SR500 exhaust nuts or custom M8 SHCS with smaller OD heads. What vendor do you suggest. Several vendors on ebay offer 60mm carb holders for the VM32-34 so figuring same part from everybody. Mikuni flange, M-VM34-200K, appears to have the correct mount bolt spacing and 8.5mm hole size, ordering one today. We'll see.

I remove the studs and use allen head or torx bolts to attach rubber manifold adapter to cylinder.  The 200K part number sounds like the correct one.  It's been awhile since I got one but I think I have one around here someplace.