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Alan Nyhus · 10-13-2015, 10:10 PM

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

10-13-2015, 10:10 PM	#42
Alan Nyhus VIP Member Join Date: Dec 2002 Location: Lower Dakota territory Posts: 1,166 Likes: 1,016 Liked 762 Times in 226 Posts	Re: Merge collectors 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 __________________ "That'll never work....." Last edited by Alan Nyhus; 10-13-2015 at 10:12 PM.