Header gasket quality
My experience with my
BBK shorty headers and BBK H-Pipe has not been that positive. The gaskets that came with the headers crumbled after two weeks, they had to be replaced.
I'm taking a portion of your statement to insert this which I wrote last year. Again, I am only using part of your statment which has other valid issues that I am not addressing in this post but are defintely worth sharing with everyone here.
Header Gasket Quality
Most any gasket will seal well if installed/maintained properly.
At least 95% of the header gasket failures you hear about are caused by loose header bolts.
Very often I hear people say "xxxxx header gaskets are the best. I had the ones that came with my BBK headers on my car and they leaked, but then I bought xxxxx's and I haven't had any issues since then. That proves that xxxxx's are the best."
Here’s why this happens-
At some time in their life, the person making this statement has suffered through an exhaust leak to the point where they decided to take action and get a new gasket set, then they went through the time and trouble to remove the header(s), scrape the surfaces clean, and install new gasket(s).
At that point they became painfully aware of how time consuming and frustrating the whole gasket replacement process is, and only then did they make sure that they really paid attention to how tight the header bolts were, and then added them to their periodic under hood visual checks.
Check the oil, check the header bolts.
The 1st set of gaskets always gets ignored until they get cooked and fail, while the 2nd set becomes a point of focus. That's why the 2nd gaskets never fail, but become "the best gaskets ever" in the users’ opinion.
How does the header gasket get cooked?
The bolts that come with the BBK’s headers (like any good header bolt) are more than sufficient as long as they are properly maintained.
If the bolts come loose, the header can separate from the head and then exhaust passes over the gasket surface (instead of through it) and the gasket gets cooked and it breaks.
Some people like to use ARP header studs or Stage 8 locking bolts. Those both add cost and take additional work to install. However, those are good products for those guys who don't look under their hood as much as they should.
BBK has supplied the same gaskets for years and yes, a few years ago I had one cook and break on me.
When I took it apart the bolts were loose which is totally my fault.
The only difference is, I replaced it with another BBK gasket and started paying attention as suggested above.
That replacement gasket is still in use today.