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Discussion Starter · #1 · (Edited)
This is the result of a half second full throttle burst in 1st gear even though my 14" X 3" AC Delco air filter is almost new. Light throttle cruising doesn't budge my indicator but a 4 to 5 second full power burst will send it into its red zone which would indicate a 14" X 3" filter isn't big enough for a high-perf 454" engine under full power.

I believe 8" Wc is acceptable for naturally aspirated gasoline engines running at freeway speeds but that is a maximum and an indication the filter needs to be serviced (cleaned or replaced).
 

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