Merge collectors

[Exhausted]

Originally Posted by Alan Nyhus

Thanks, Calvin. Initial dyno work was done with a decent set of 1 3/4 dyno headers with a good merge collector. A set of good 1 5/8-1 3/4 headers with a very good merge collector was worth 8 hp. over the 1 3/4 dyno headers. The motor was freshened up (including a different cam) and we started with the 1 5/8-1 3/4 headers for a baseline. Then we put your 4-2-1's on and with no other changes picked up 11 hp and a big bunch of torque starting at 4,400. I had expected to see the torque pick up but wasn't expecting the h.p. increase. -Al

Don't neglect lengthening the secondary tubes. I purposely make the secondary tubes shorter than ever needed. More often than not you will pick up even more power. There is no way to know exactly what a given motor might want for both length and collector diameter. If you do not have 4 extension tubes to move the final collector back than give me a call. I'll fix you up. The more you keep me updated with how your motor is responding to the headers or not responding the more i can help you. And don't be afraid to keep richening up the carb until you slow down.