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14. We warmed up our 426 late-model Hemi and made a couple of short pulls using the Holley 850 Ultra HP carburetor, and were surprised at how smoothly this engine idled. After installing the 950 carb and making a jet change, our Hemi really came to life. Only making four total pulls on the engine, we netted more than 719 horsepower and well over 600 lb-ft of torque!