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Re: Dynomat under firewall pad??
Depends on which product you are using. Just saying "dynomat' leaves several options, as there is sound deadener, heat barrier, insulation, and a moisture barrier product.
The thicknesses range from less than 1/8" to almost 1/2".
If your firewall is getting hot enough for the insulation to sag, you've got other issues.
Ceramic coating on the headers(if you are running them, or on stock manifolds) will greatly reduce underhood temps. You can also add small relief vents in the fenderwells that can help get rid of the funnel effect of the air pushing up against the firewall. The way these are designed, all air coming thru the front grill opening goes thru the radiator(that's a good thing), but the shape of the fenderwells, funnels the air to stay under hood and only exit over the back and underneath the engine, which is just transferring the heat from the engine to the passenger compartment.
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