The HT383 has been available for a number of years now, and it’s an excellent repower option for you GM (on non-GM) truck or 4×4 thanks to its rated 325 hp at 4,500 rpm and 415 lb-ft of torque at 3,500. It’s true that GM’s aluminum-headed Fast Burn 350 makes 385 hp and 385 lb-ft

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