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How to measure header size?

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Old May 2, 2011 | 01:49 PM
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Default How to measure header size?

I just bought a set of headers from one of the local corvette guys in my area who is returning his car. He is not very knowledgeable about car parts but told me the headers first were dynatech's then later told me LG. I was a little optimistic about buying them but after he gave me a price for the headers and the crossover pipe ($300) I just couldn't refuse. So I brought them home and come to find out through my own internet investigation that they are kook headers. Every little detail matches up with the online pics of kooks and and my mystery headers. The one thing I dont know for sure though is what size these headers I got are. He told me that they were 1 7/8 but I am reluctant to believe him now. How would I be able to figure out what size they are? Thanks
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Old May 2, 2011 | 02:07 PM
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I hate to sound obvious, but measure the diameter of the pipe.
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Old May 2, 2011 | 02:40 PM
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I thought so but didnt know if that was the right way to measure it. The pipe looks to get a little smaller after the flange so I didnt know if just straight up measuring the diameter of the opening on the flange was the proper way to do it. Thanks
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Old May 2, 2011 | 03:34 PM
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Find a straight section of the tubing and measure the o.d. (outer diameter). Tubing is always measured by the o.d. and not the i.d. like pipe is.
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Old May 2, 2011 | 04:05 PM
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In my personal opinion unless you are pushing over 600 rwhp then the 1 7/8 is a waste. Not sure about Kooks but I think LG routes the 1 7/8 pipes different than the 1 3/4 (to the collector I mean.) This might be easier than measuring if they are on the car. Anyway for $300 why even worry what they are.
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Old May 2, 2011 | 04:42 PM
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Tape measure around a section that isn't bent, then divide by Pi.
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