I have read about these test on and off for some time in regards to this TA 350 manifold vs stock test. This intake was tested to death when we first released it. When it was in design I went as far as have flow boxes made from the cores before the hard tooling was made. This was to compare results to which ever stock intake we had at the time. They were made out of plaster, still have them. Ed Mosler designed the intake in 1982-83, still have all the pencil drawings which are pretty cool. Jim Bell was on board to help with testing. On the wagon it was worth 3 tenths. Car went from 12.60's to 12.30's. From what I know today some of this could be from my driving habits back then. But I do not remember any results of no improvement like I've seen here in the past years. The 350 intake is sold to all level of builds and the feed back we receive has been positive. Every test, every engine will provide some different information.
I do agree that if a intake can provide enough air to satisfy the engine a aftermarket intake may show no improvement. The other thing I remember is when Ed Mosler did his flow testing of the intake he said it picked up the air flow of the head. Which he indicated then that it was because of a problem with the head. At the time he also indicated that would be a plus, but not making it right. I cannot tell you which head it was tested on, what the valve job looked like and so on. Jim Bell also had positive results when tested on Forrest Thornburg's 350 Skyhawk. The intake was tested by GSCA members back then as well. I do not want to get into a debate over this, just wanted to share some history. If we didn't see positive results, and those of you who know me, you know I would have gone back and fixed it.
On another note, I once talked with Jim Poston way back when about the S-Divider intake, about its lack of performance, which he acknowledged. In the end Jim said to me, "Why should I spend the money to fix it, when I will sell 100 intakes a year either way".
Well, that's not me folks, I would have fixed it.
One more thing. The 350 heads have been designed around 1.940" & 1.550" valves. If I remember correctly a 2.050" intake can be installed. We never tested with that size intake valve. We also increased the the spring installed height by using longer valves. The stock 350 is 5.0" long I believe. Were going to use 5.15" which is the length of the 455. So the 2.0" performance intake valves we stock can be used. The exhaust can go to 1.600" but at this time we feel it will not be necessary. I have a bunch of 1.625" 455 exhaust that I may have machined into 1.550" or 1.600". I excited to see what everyone will do with these heads over time.
Thank you for sharing, Mike. Very insightful and valuable.
Good things are on the horizon!