Engines and Components› Belts and Pulleys

Platinum Racing Products (PRP)

LS1 Alternator Conversion Kit

$683.00

SKU: PRP-ALT-CONV-KIT

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Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
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Easy — 1–2 hours

Overview

The Platinum Racing Products LS1 Alternator Conversion Kit is designed to replace your aging SR alternator with a more reliable unit. The kit includes a custom billet alternator bracket, a custom billet block adaptor bracket, and adjusting hardware. It also features a 20% under-driven alternator pulley suitable for SR 5-rib belts and offers an optional JAS LS1 Alternator with a 140-amp output.
Show original supplier description
The Platinum Racing Products LS1 Alternator Conversion Kit offers a significant upgrade over the stock SR alternator, which typically outputs 70-90 amps and is prone to age-related issues. This conversion kit allows for the installation of a GM LS1 alternator, providing a robust 140-amp output, ideal for modern builds with aftermarket ECUs, fuel pumps, or upgraded ignition systems that can easily exceed the OEM alternator's capacity. It features a 5-axis machined billet block adaptor bracket and an integrated adjuster bracket, ensuring the alternator is mounted as close to the block as possible for a clean and efficient installation. The package includes the PRP Custom Billet Alternator Bracket, PRP Custom Billet Block Adaptor Bracket, adjusting hardware, and a 20% under-driven alternator pulley designed for SR 5-rib belts. An optional JAS LS1 Alternator, equivalent to the discontinued GM 92058857, is also available. Buyers can select from various color options for the bracket and pulley components, with the assumption that all selected components will match. For custom color requests, customers should leave a note at checkout. The kit is intended for track use and should be installed by a qualified mechanic. It is crucial to note that these kits DO NOT fit the GTI-R SR20 variants.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandPlatinum Racing Products (PRP)
Part NumberPRP-ALT-CONV-KIT
CategoryEngines and Components
5,000+ Trusted brands
1M+ Enthusiasts
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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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