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Tuning up a GM HT383 crate engine to big power and torque. Jim Brown – Dec 21, 2020 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 4x4 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 for just an extra $100 over the HT383 s typical mail-order price. However, we ll show you that an out-of-the-box HT383 is no slouch, and just a few well-chosen add-ons can make it scream well past the limits of the Fast Burn 350 s potential thanks to its increased displacement of 33 cubes. Best of all, you can add the stuff as your budget allows. ....