open headers vs. cut offs

Old 01-25-2013, 11:47 AM
  #1  
bixblk
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Default open headers vs. cut offs

Let me run this pass you guys, my 3600 lb street chevelle runs very well, it has fresh 540 Nyes BBC init. I drive the car on the street so I have exchaust cut offs directly off the header collector. They are the unbolt kind not motorized. They are 3 inch as is the exchaust. At the track I open the cut offs and put front and rear tires on the car. It has a good set of headers on it 2 1/8 inch to the collector. My question is do you think the cut offs are enought or should I modify the exchaust to drop out a section so I can run the collector or header open. Has anyone every tested this or had experience or an opinion on this. Let me know Thanks
Jeff Magnuson 708-308-0282
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Old 01-27-2013, 09:37 AM
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roadkill2
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It might make a small difference, but if you're a Bracket racer, what's a half a tenth?

I was talking to one of the baddest King Street/Pro footbrake racers in our area yesterday and I asked him how come he runs mufflers on his Nova, because none of us race where they're required.

He said it was so he could hear us fast guys coming up on him . . . He listens for the "Whomp" and knows how much they dialed down or up . .

He is a killer even when he runs against the "Box" guys . . Mucho feared, always in the semis or finals . .

Take that one to the F--king bank!
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Old 01-27-2013, 12:09 PM
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bixblk
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Default yep

I feel the same way, my chevelle performs fine, I was curious. Thanks
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Old 01-27-2013, 12:19 PM
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TheYellaBrick
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It's a proven fact that many engines perform BETTER with some corked up back pressure. I LOVE that racers method of beating the open header guys !
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