header tube sizing?

OK, I was just wondering if anyone had any idea or knew of a calculator to find the estimated tube sizing of a header. I run a NA motor in Top Dragster and plan to go Blown Alcohol for next year. I have a set of zoomies right now that I have never run. I dont know if they can work for my current motor. It's a 565, single carb gas motor thats about 920-950hp and runs at 7500 max rpm. I currently run an apswept header with 2 1/4" primarys "I think". I know they are not any bigger than that. THe zoomies I have are 2" tubes. Could these work for me? I just like the sound of the zoomie and would love to try them at the track.

Your thoughts?

Thanks for the help.

 

I ran a 565 alky injected motor in my 4 link and then in my F.E.D.. On my four link I didn't see a diff. with the zoomies (2.25in) my guess is that the weight I saved was lost in HP. Sounded cool though, but when I put on a set of steped headers with a merged collector I picked up some et. So, won't hurt your motor but won't help much either. Also, I feel like 2 in. is a little small, sould be at least 2.25 in, and on your blower motor 2.5 in. I run 2.5 in. on my blown 509 chevy and so do most of my friends. Hope this helps, Jody Stroud TD 9325

 

Thanks. We figured the same thing. save a bit of weight but lose some horesepower.

 

your best bet would be call smiley..he makes a lot of ta/d tf/d..Dave
www.myspace.com/daveloweswr