What do you guys think about a 6" stack on a OIL fired 2x6?
I just picked up a used leader rig that (to my surprise) has a 6" stack! The collar on the arch is also 6" round, and not oblong to fit a normal base stack. I plan on purchasing brand new stainless stack, but before i do.. I wonder if I should i somehow enlarge the collar to get the larger draft friendly 8". I have read a few old posts that relate to draft on oil rigs... Sounds like the bigger diameter the better, for oil fired as well? I have a smaller 2x4 rig with an oblong collar and 7" stack...should I swap them out and throw the 8" stack on that? Am I making more out of this than I should?

Thoughts?

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Thanks,