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Discussion Starter · #1 ·
I am planning on using dynamat or something similar in my 68 for noise/heat control. Would it be terrible to not put the factory firewall insulation back in? It appears from the assembly manual the ac box sandwiches it between the inner box and the firewall. My feeling is I wont have an issue as long as i seal the box properly to the firewall on the inside. Anyone else done this?

Eli
 

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depending on what you use you can leave it off. Just be sure and replace it with the new stuff
 

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Discussion Starter · #3 ·
So do i need to actually sandwich my new stuff between the box and the firewall or can i use heavy duty foam sealing tape to seal the box and run the dynamat right up to the box?
 

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I didn't do that (sandwich the insulation) on my 68. I think if its sealed as you describe, it will be better. I used thermal and acoustic insulation glued to the firewall. Look for cracks in the fiberglass where the trans tunnel joins the firewall.
 
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