Are you talking about a stock heater or a stock AC box? The Gen 4 is slightly larger than the stock heater. With the stock heater, I laid the PCM flat on a piece of aluminum and it worked fine. The VA comes with a "glovebox" but I am trying to figure out how to use it and mount my PCM in the area above the AC unit and the dash. Between the ducting and the VA unit, there is not alot of space to mount it and still beable to access it without tearing it aprt (ductiing and such) if I had ro remove it.
I currently have the PCM mounted in the glove box space. "Mounted" is a term I will use loosely, positioned would be a better way to put it. It is between between the dash and the AC unit. It is secure in there, I just don't like it there because I want my glovebox storage back. I have been driving like this for over a year and a half without any problems (had a surefit kit in before this). Let me know if you have anymore questions. I am gathering all of my info and want to do an install article to post on here.
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Chris
1968 Camaro SS
LS3/T56
Full of DSE and Holley parts
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