I believe these are made by new era. I have had them in my truck for years thinking they were 435s. They need to be cleaned and I do not know what the pop pressure is at. These flow a good bit of fuel and the 5x16s I put in are clean in comparison. I couldn't tell what size the injectors were so I had them measured at a machine shop. They verified size by some sort of optical doodad as well as wire gauges. These are running and working injectors. The edge filters have all been removed. I will consider trades. Asking $400 or trade.