Yup, the 5303’s have beaten every header I’ve tested them against.
I have several engines getting ready to dyno. 340, 395 and 416 inches. I’m going to test them all with 5303’s and I also have a set of Hedman 1 7/8 headers I’m going to test too.
If I really feel like burning dyno time, I’ll test some TTI’s and some cheap *** headers I have that already beat the TTI’s.
You can't find the good headers any longer. I called TA and they said that their headers won't fit a 1971 Dart. I was under the understanding all A body engine compartments were the same? Will fit a Demon but not a dart from what they said.