Header/manifold dyno test

Again data that shows Vizard is not wrong but not enough data to show he is correct either! He says in a V8 tube length is a second order effect because of the way the pulses occur in a V8. What needs to be done in a test is vary the collector length. He says on a V8 that is the most important parameter. Also I can’t tell if they had an H pipe between banks. It does not look it. That is something else that is missing that would be interesting.

Nice to know my choice of no headers on my engines that are built for low end torque is not a bad choice. I always model my builds in Performance Trends and that analysis showed I was giving up little by not using headers as well.

In-line 4s or 6s on the other hand the firing order is perfect for the front bank to scavenge the rear bank and you can get a serious torque boost which I have seen in the models and real dyno data I have gathered from various sources.