Juggernaut
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After 9 years of thrashing, the GM Performance Parts Mark IV 502 just keeps coming back for more. Jim's never been nice to the 8.75:1 motor and has been surprised by how well the thing has lasted, considering how many times he's hit it with the 250hp shot of nitrous and the wide open throttle of the 930-cfm Predator carb in the mud and occasionally on the street. The engine's not pretty, but it has never given Jim any problems and has kept him surprisingly competitive in all six classes of mud racing. View Related Article
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