I have but on engine masters they compare one combination with the different header sizes what they don’t do is show the differences of overlap on all the tube sizes also the difference between tri-y and long tube on an smaller displacement engine where the torque peak is around 4500 RPM let alone the difference between dyno and chassis headers performance. There can easily be a 35 to 40hp loss in header performance before normal parasitic loss.
I am referring to season 5 episode 18 where they literally ran a 1 3/4 Schoenfeld dyno header against a 1 5/8 Doug’s Tri Y (2.5” collector and all) on a 383 in the upper mid 400 hp range. The Tri Y hung well with the dyno header - within 5. The rest were worse. Fluke or ligit I don’t know - a lot of things can be done I reckon to convey the results you want to convey on TV so I guess grain of salt. I’m not too worried and honestly I am not going to find a 1 3/4 4 into 1 that fits worth a darn in this car. BTDT. A long time ago I went through like 3 or 4 different sets to find what would fit best. I would have kept the ones I had (hooker I believe) but having them coated was about the price of new coated headers and they were dented and clearanced pretty hard so were rather ugly… so I guess it doesn’t matter if I lose 5 or I lose 25. If my dyno guy would have had the provisions to run the Tri Y I had I would have but it didn’t adapt well to his exhaust / muffler system. So kind of limited to what fits and works…. Either way upgrading to a toploader and 9” is directionally correct so I don’t have to spend more $ down the road.
Buttoned the engine back up after getting headers in place. Added a phenolic 1” spacer between carb and intake. It likely won’t have any negatives. The RPM intake seems to generally respond well to a 1” open spacer. This pro-systems carb though uses a 5/16 thread for air cleaner stud. So I grabbed a piece of 5/16 round stock and fired up the lathe and whipped one out. I have a 4” Wix element - good thing for the teardrop. Onto the cooling system adventure. It’s been another challenge.. Even found this surfing the eBay. Figured it would be fitting on the air cleaner.
The Jalopy Journal
