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dmir55 · 10-06-2015, 01:15 PM

We set a national record with a set of Hedman step headers on 302 ford. The pipes were 1 1/2 to 1 5/8 step. You can't use there collectors as they are no good for a race car. The collectors we used were made by Headers by ED of Minneapolis MN. He doesn't use a merge type of collector but uses his own style that seems to work just as well. And it is a lot easier to make. Ed no longer makes complete pieces, but has every thing you need to make your own. Now day there is a lot of satisfaction in doing your own stuff. Eds collectors when we finished them were 2 3/8 minor od 2 1/2 major od. One last thing. I talked at length with the late great Jack Davis of Hooker and Davis headers about design. Of all the information he shared with me, one thing he said was about testing. He felt headers had to be tested at the track not on a dyno. Hope this helps and happy motoring.

10-06-2015, 01:15 PM	#26
dmir55 Junior Member Join Date: Jul 2014 Location: northern Minnesota Posts: 64 Likes: 0 Liked 0 Times in 0 Posts	Re: Merge collectors We set a national record with a set of Hedman step headers on 302 ford. The pipes were 1 1/2 to 1 5/8 step. You can't use there collectors as they are no good for a race car. The collectors we used were made by Headers by ED of Minneapolis MN. He doesn't use a merge type of collector but uses his own style that seems to work just as well. And it is a lot easier to make. Ed no longer makes complete pieces, but has every thing you need to make your own. Now day there is a lot of satisfaction in doing your own stuff. Eds collectors when we finished them were 2 3/8 minor od 2 1/2 major od. One last thing. I talked at length with the late great Jack Davis of Hooker and Davis headers about design. Of all the information he shared with me, one thing he said was about testing. He felt headers had to be tested at the track not on a dyno. Hope this helps and happy motoring.