Over the past few years, we have grown to love the Holley Mid Mount Acessory drive kits. However, there are issues with their alternator that cause it to fail prematurely. Level 7 has worked with Powermaster to resolve these issues. The alternator that comes from Holley suffers from two issues. The primary issue is that the pulley ratio is off substantially and over spins the alternator. The second issue is that they have an internal grounding problem and causes them to search for ground and will burn out the voltage regulator. Our replacement alternator comes with an external grounding stud and can be grounded to the engine with a 4awg cable. It also comes with a 3" pulley which slows the rpm down to correct the pulley ratio issue. These alternators dyno at roughly 145-amp output at idle so there is no need to worry about output at idle. This is also a self-excited alternator so there is now no need to wire or connect the excitor connector. We have been using these alternators for 3 years now without a single failure. We even put them through the severe abuse of road racing in our yellow and white Squarebody for two seasons without issue. That truck shifted at 7400rpm and would race at full load for 25-minute sessions. So, rest assured that your alternator issues are the thing of the past. Click here for a little more info. This is a direct replacement for the many different Holley Mid Mount Accessory Drive systems. These are commonly referred to as the "Hair Pin" LT style alternator. Made in the USA Self-Excited (do not connect the excitor circuit) 3" Pulley 175 amp Output (145 at idle) Raw or Black Coated External Ground Stud LT Style Fitment The belt supplied with an LS / LT Mid Mount Kit is a 675K6. This alternator will require a 690K6 belt. Select the option for us to include it. The belt supplied with an LT4/ LT5 Mid Mount Kit is 701K6. This alternator will require a 720k6 belt. Select the option for us to include it. Please make a note at checkout if you are purchasing this for an LT4 / LT5. https://youtu.be/ILNRdC5n_fA?si=vui72GMroT-KXyGK Video Summary: PowerMaster Alternator Upgrade for Holley Mid-Mount Accessory Drives In this product spotlight, Jesse from Level 7 Motorsports explains why many high-performance LS and LT engine builds experience repeated alternator failures when using the Holley Mid-Mount Accessory Drive system and how the PowerMaster alternator solves the problem. During extensive track testing, Level 7 Motorsports discovered that factory-style alternators supplied for Holley mid-mount systems were being consistently over-spun at high engine speeds. Engines regularly operating at 7,000 RPM were turning the alternator well beyond its intended operating range due to an undersized alternator pulley. Excessive alternator speed, combined with less-than-ideal grounding, often resulted in premature charging system failures. After an entire season of testing and troubleshooting, Level 7 Motorsports found the PowerMaster alternator to be the long-term solution. Unlike the standard replacement alternator, the PowerMaster unit uses the correct pulley ratio to properly match the Holley Mid-Mount Accessory Drive system. This significantly reduces alternator shaft speed at high engine RPM, helping eliminate one of the primary causes of alternator failure in performance applications. The alternator also features a dedicated external ground lug. Rather than relying solely on the alternator case to establish a ground path through the engine, the external grounding provision allows a direct ground cable to be connected to the engine block. This creates a more reliable charging system and helps prevent voltage fluctuations caused by poor grounding. This alternator is a direct replacement for Holley Mid-Mount Accessory Drive systems used on: LS engines LT engines Small Block Chevrolet engines equipped with the Holley Mid-Mount system Because it retains the correct hairpin-style alternator case and factory mounting configuration, installation is straightforward with no modifications required. If you're repeatedly replacing alternators, experiencing charging issues, or operating your engine at sustained high RPM, this PowerMaster alternator offers a proven solution that has been tested extensively by the Level 7 Motorsports team. By combining the correct pulley ratio with improved grounding, it delivers a charging system designed to withstand the demands of serious street, autocross, and track-driven vehicles.
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