Pontiac Tri-Power 389 Engine Upgrade - 21st Century Tri-Power - Pontiac Tech
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The piston and rod assembly are beefier than the cast stocker. Wiseco's forged piston is mated to a 6.8-inch-length Eagle H-beam forged rod. A set of 7/16-inch capscrews attach the rods to the crank. View Related Article
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