I have also spent a lot of dyno time with sbc and had the same results Jerry mentioned. Dynos had mass air flow sensors for years before cars and something I've noticed is larger exhaust kills some low end torque. Horsepower is not really affected till high rpm range. I think the loss of some exhaust scavaging with the large manifold is the reason since the maf sensor shows a drop compared to the smaller manifold. All the readings are so small that they are insignificant on a street engine.














































































































































































Evan