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The original airbox on my '82 lasted 192,000 miles. I had, early on, set the Warm Up Regulator on the rich side of the scale, and simply dealt with a "hunting" idle during the first few seconds following a cold start. I discovered hairline cracks along the assembly seam, above cyl #3, when I had the engine removed to replace the cam shafts, and replaced the airbox at that time. I never even considered adding a pop-off valve, and it's been more than ten years since the replacement, without a single backfire. Jonny H and the iceman said it best, no toilet bowl for me! And, BTW, we NEVER used them at my shop either.
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Keep the Shiny Side UP!
Pete Z.
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