1966 Mustang thermactor filter

Steel Ride Mustangs

New Member
Feb 11, 2018
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Tomball, TX
Hi All.... Just removed the thermactor smog filter canister... it is empty... Can someone please help identify the proper filter that should be inside this canister. I searched and no results...thanks for your help... can running the car without this filter damage the system1??
 
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Realmongo

I prefer to be called "Evil Genius"
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Oct 10, 2001
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Western Mass
Looks to be the exhaust air supply cleaner used in '66 and '67.
Ford used to make a service package for these, but I don't think you will find one anymore, which is probably why it had been gutted.
 
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garth66

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Nov 27, 2006
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When I restored mine years ago, I found the crumbling remains of the original foam filter inside. I took the filter canister with me down to the local motorcycle shop and purchased a new foam motorcycle air filter that fit. It's just there to prevent anything (bug, leaf, pebble, etc) from getting sucked in and clogging the thermactor exhaust air injector tubes. Get a foam filter as I believe a paper filter will likely be too restrictive.

Frankly, my heads were extensive reworked for improved performance - hardened seats, larger quality GT40 valves, ported, flowed and port matched to the intake and exhaust manifolds - and had the tubes shaved off flush with the inside wall of the exhaust port in the heads. So, all stock looking from the outside, but much improved flow inside.
 
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