Hey word to the wise. I ordered one of these 4-cam model engines in early April from an online vender called Flat Six Fanatics, email sknandigam@gmail.com
Never heard a word from them after that, despite several polite queries.
I took it up with PayPal which sent notice today that they're refunding my cash. So PayPal did right.
No idea what Flat Six's problem was or is, but their website still has the item listed for sale. FYI