Had some header built last year for the car and requested 2 3/8 primary and 31 length. How critical is it that the header tubes are equal length. On both sides headers are approximately 31 length with the exception of one tube that is out almost two inches. A friend just a had a set built and his fabricator went to great lengths to make the tubes precisely the same length ?

Thanks for the info Mr P. LSA is 112 so this should help minimize the effect of the shorter tube. I was a little tiked to find out the one tube was that much shorter !

It won't make any appreciable difference at all. The most important thing with headers is matching the tube diameter and collector diameter. After that collector length. Primary tube length would be the least of my concerns.

Basically the primary (diameter and length) are the
rpm range and the collector is torque... being that
you have a 112 LSA its not a major issue being it doesnt
have a lot of scavenge going on(it still has it but
not near as much as a 105 LSA)

That collector muffler is going to hurt you more then anything.

Lets see there is short side and long side of each pipe, and it changes length around corners, correct?

Those look like a real nice set of custom-built headers! As stated maybe the collector/muffs are restrictive? If you REALLY want accurate pipe lengths then seal the flanges and measure the volume with water. But I think your worried about nothing...those are nicely done. I honestly wonder if all these equal-length (exactingly) tubes would pass the volume test i just described. I just don't think it's all worth the energy. Lets see the pass side.

No reason to be a little tiked. Scavenging occurs at a wide rpm range, yes length makes a difference of were it occurs but the cushion is around 8',s or so. your 2' difference is well within range.

Thats good to hear. Will have to wait and see how restrictive the collector mufflers turn out to be but they really don't look to be very restrictive.