It stands for Anti-Vibration. I have two Stihl saws made in the 80's (an 015AV and an 034AVSuper). The 034 replaced a really old 041 without the AV, so I can attest that it really makes using the saws a lot more comfortable if you plan on using it for more than an hour or so at once. But then again, all the new Stihl saws have the AV now :o)
The 1985 Stihl 024 AV is 44.6 cc.
51.4cc
41.6 cc
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Anti Vibe
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.325 pitch
Check out the related link below for information.
The 056 was made from the late 1970's to the mid 1980's.
How many cc in a Stihl chainsaw
AVT stands for Anti-Vibration Top handle
A STIHL 045 av is 75cc and the max recommended bar size for it is 32". However... If you have a 045 av Super then it would be 87cc and the max recommended bar length would be 36". So it depends if you have a SUPER or not. It is easy to tell as it will say SUPER on the top tag right below 045 av.