Stirlingkit.com is sketchy, and a scam. The customer service email (maybe this was clue #1) is a name#Gmail account. I ordered a engine they said was in stock, cost 999$ that's a lot of dough for a toy engine (enjomore dohc), plus a starter kit for it ,cost Another 100.00. Plus shipping Full purchase 1200.00. I waited a month and checked in with them to see if it would ship soon. Told me it would be shipped in 2 more days. Waited a week. Checked in again they said it would go out in the next week. It's now been 45 days and iv not seen it ship. So far, iv gotten emails back from a Mona, last one I sent requesting a refund. Sent 34 emails, over 7 weeks beyond the original purchase date. It takes 2 days to get a response. I get a excuses every time why it hasn't shipped and multiple times, promises that it will ship by certain dates, but it never does. But it's been long past my patience on a thousand dollar RC engine, that was supposed to be in stock, and still not shipped. Iv asked them for a refund and am still waiting on it, have not seen it returned back to my credit card. I wouldn't recommend anybody buy from This website. Plus manufactur is in china. Goodluck on seeing that $$$ again...