Switching to the larger 20AM air flow meter

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I am running a slighly modified 4.6 in my chim and have been given a 20AM Airflow meter which I would like to fit in place of my 5AM.

Accordingly have been researching and it looks simple enough to do then follow up with remapping.

Great info here at RPI.
http://www.v8engines.com/carbs-2.htm
About 3/4 down page.

It mentions fitting a "co trimmer" anyone know what that is ? ie the little device in this pic.

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Thanks for clearing that up Mark. I was wondering about whether it was needed for white/cat map.

I do have all the stuff for burning new eproms for the 14cux. Might see if I can get a staring point map just to experiment with.