They are good & bad just like any other parts suppliers, they have "some" Chinese made & American made products, also Mexican, Canadian, European & Japanese too I'm sure, there are both some name brands & off the wall cheapo brands... As any engine build ask a bunch of questions about the parts, they have some good & some decent & some junk parts you need to research them thoroughly... I have used a few of their 3.95", 4.15", 4.25" Big Block B & RB stroker parts in the past, also a 4" SB stroker set up for a 318/390ci years ago now, with no issues what so ever, I also now a few engine builders that use some of their parts for the Mopar Muscle Magazine Engine Challenges with great success, I know a bunch of racers that swear by them also... I did have a bunch of issues with the early "Stealth" Aluminum Big Block Wedge Heads though, they supposedly fixed those issues now, I wouldn't suggest using them, but many people love them, so it's your choice of course.... I personally would Call Mancini Racing or Ray Barton Racing for some of the best & knowledgeable MOPAR engine builders & stroker parts available, maybe very slightly higher prices... 440source does have some quality, decent name brand U.S.A. made parts, at a discounted price, and some Chinese made stuff too, you just need to do your research before buying any parts, from any parts source, "any were, any time".... Most people that badmouth them have never used any of their parts ever, they were better than they are now "maybe", at one time, I don't know that for a fact, I didn't know they got sold either, it's been a couple of years since I purchased anything from them now, many parts are made in, machined in & assembled in "THE U.S.A.", Remember you can't believe every thing you read on the web, some people just have an negative agenda & will post lies or complete exaggerations... Remember just because you pay a premium price for parts, doesn't mean you get premium parts, sometimes it just the same part, marked up in price to pay for advertising, racing sponsorships or something else... Good luck with your stroker build....