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What are you running for an ignition system? I put in the GMPP distributor, Hypertech coil and MSD wires and it made a huge difference. The truck runs a lot smoother and cleaner and picked up almost 1 mpg. I average 11 mpg with the 454.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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