Not Ranked
I use the shallow height filter on my 408W with oval air cleaner, and it works just fine.
On the dyno, it made no difference on or off.
Remember that 427SOs had that single stelling 8" dia filter, and they didn't exactly hang around either? I believe someone on CC actually checked the effect of that particular filter on his 427, brought total power down by 5HP from memory.
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Wilf
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