What Does a Dirty Air Filter Look Like?

[1966Step]

Embarrassed to show this so lay it on me, but I have a question. This is my new vs. old air filter.. Is it clogged? lol! My new local shop rebuilt the carb (on their recommendation) and didn’t change out the air filter. .I assumed this would be done (isn’t that normal if you are going through the trouble of rebuilding a carb?) When I got it back it Idled fine..but was backfiring some (finally blew out the muffler when trying to start it the other day) and bucking when laying off the gas (accelerates OK). So checked the air filter and this is what I had...probably causing a few problems.

Gonna learn how to use/test with vacuum gauge today if it warms up enough and I’m interested to compare readings for both filters out of curiosity now and then take her for a short drive (no muffler).