Remove the flex plate from the back of the motor using an impact gun to take out the six bolts during cracked cylinder head repair; learn how in this free auto-restoration video. Expert: Doug Jenkins Bio: Doug Jenkins runs Doug Jenkins Custom Hot Rods in St. Louis, where he restores classic cars and creates mild to wild custom street rods. He races a 1972 Corvette in the SCCA performance rally series. Filmmaker: Ross Safronoff