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Re: cowl vent
Anything you do to insulate the hood will keep heat in rather than get it out of the engine compartment.
If everything is in place and works as it should air flow should evacuate most of the engine compartment heat out and away from the truck as you drive down the road.
To go along with that have you done anything to create an airflow issue? Sometimes our great looking custom inner fenders or other pieces may block the natural airflow that was there before.
On the other hand if the engine never runs hot under any situation you probably don't have a real engine compartment heat problem outside of the heat transferring into the cab because you don't have effective insulation. I've got that in an OT truck that has half the floor mat and padding missing and a hot floor.
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Founding member of the too many projects, too little time and money club.
My ongoing truck projects:
48 Chev 3100 that will run a 292 Six.
71 GMC 2500 that is getting a Cad 500 transplant.
77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.
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