427 is on my list of macmhines I would never buy. Keep reading, you will find lots of problems with that machine. The engine is not very common and it does have issues. The other problem i have read about is the coupler on it. The coupler is a special design and lots of people have had issues with it as well.
I just wouldn't buy a machine knowing it had engineering defects like that.
That being said, even though i am not a fan of
prochem as a company i do think most of their other machines are good.