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When I first got my banshee coolhead I trial fitted one dome without orings and it went in easy and was a pretty tight fit. I had to give it a bit of a whack with a deadblow to bet it out.
If yours has sealant in there it may hard to get out. Depending on the sealant used, some heat may help

They seem to make a lot of Harley stuff, all billet.

Banshee ones had an oring around the spark plug boss like this to seal.

That mod started on banshee heads so that guys could run different cc domes and 4 mil cranks and still keep the motor looking completely stock. Now stealth coolheads that look just like stockers are available that have orings to seal so you dont really see stock heads being cut up anymore.
There are a lot less choices for RZ's though. Wicked and the place in Spain are the only ones Ive seen lately.

Hpi has an adjustable stator plate so that you can easily make small adjustments without removing the rotor.

Actually, these had an o-ring.  If you look closely you can see a groove around the perimeter of the machined insert.  This was first time doing this,so I may of messed something up. 

Coolheads use min 6 orings That oring around the dome insert only stops coolant getting into the combustion chamber. The second one would need go around the water passages in the head. The stock head does not look like there is enough material at the front bolt area.

I got a Jemco made up for my TM/TS400 project. Took about 8 weeks, looks pretty nice, but not necessarily inexpensive.

Never seen a head pipe made that way with the straight section. I might try that for the next set of pipes I make.

If that's machined like a coolhead or the heads Wicked makes it should have an oring to seal the boss area.
Pity he could not machine a groove for an oring around the outside as well. That would make removing and reinstalling the head soo much faster.

So HPI uses a keyway, vape does not unless you go with HVCcycles keyway? What is HPI set at, timing wise as hvc is set at what, 1.8-2.0?

HPI does not have a keyway and is set at TDC. It does not run static timing like the stock vape, it has a timing curve.

Roger Allen at Wicked Motorsports has opened a pipe shop. Might be worth a look for anybody looking for new pipes.

He is a one man show, and he makes and sells a lot of different things and does not seem to keep stock of anything so its a bit of a strange business model. The stuff that he makes that I have seen has been top quality but it was billet stuff and 4 stroke exhausts.

Looks pretty good. The guy who welded that did a neat job.
Ive seen a lot of complaints about the indonesian pipes regarding design and quality and welds cracking, but never from anybody who actually owned a pipe or has any evidence of the issues. 

The guy in India making the billet aircooled heads is also making billet LC heads now.

The new calfab arms have that same I style section, Just with a much nicer axle adjuster.[attach id=19009]IMG_6214__62961.jpg

When I read the dimension table, it appears that the belly section diameter is around 150 mm. This is way more than normal. I'd say somewhere between 90 and 110 mm seems more appropriate for a 185 cc single. In AG Bells book, the belly should be around 2.5 times header diameter, max. That would be the header diameter next to the port if using a tapered header.

The 60's and 70's design formulas like Bells have been left behind a long time ago. Much larger belly diameters are common now as is bigger stingers and stinger length considerations.