I got contact with Mark to see if we could get his files back. But it dont look like has has them anymore! So sad:(!
He had a bunch of cool stuff posted!
I had a bunch of guys pm me asking about his stuff!
I seen heads like that when I was trying to hunt down what bike this head was from.
https://www.blasterforum.com/threads/different-heads-that-fit-the-blaster-cylinder.73193/
Looks like a Airsil cylinder?
https://www.racingplanetusa.com/yamaha-airsal-performance-parts-yamaha-blaster-airsal-racing-cylinder-airsal-sport-225cc-yamaha-blaster-p-167585-1.html#.XgFtEolOk0M