Thanks Grizz, thanks to all Go gurus

Can you add some comments above, little more in depth?
So we can memorize this page as one more detailed explanation about how/what/why...

By the way, yesterday I finished to run in one new engine from Australia with black head

...about performance....no comments...because I don't know how to say-WOW
it didn't explode, it didn't run 90mph, it didn't run for 20minutes, BUT it what I could not dream, even running with 60% epa, it was aggressive at bottom, but not too much to not handle, was so quick in middle and even with 13th bell in straight I couldn't hear the end...it was too balistic at very end, even in rich settings....

I don't know what Massive has done, but it is race engine for racers with no excuse for week bottom, or not correct power band, or not good top, or not enough run time or whatever...even price is fantastico.