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Message: <blockquote data-quote="Mitchell Fosgate III" data-source="post: 8900793" data-attributes="member: 691623"><p style="text-align: justify">How thick is the firewall?  1/4 or 1/2 inch.  There is all the other items in the way.  It seems to me you will have to take out the other things there.  Take out a few valves off the engine block.  From the block outward, the alternator, several hoses leading to the radiator.  Windshield wiper motor.  Solenoid.  Battery tray compartment. Cables for the battery from the battery to the engine block.  And anything else in the way, then start from there.  But if it’s all greasy, clean it up first then drill the hole near where the amplifier will rest.  No more than 6 inches away from the wall.  GMC is great looking trucks.  Bose system speakers.</p></blockquote><p></p>

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