Looking to add serious horsepower to a Chevy 350 small block? This guide highlights five top options that bolt onto common SBC platforms, deliver noticeable throttle response, and are favored by enthusiasts for street and light-track use. The best picks suit different goals: pure bolt‑on ease, measured power gains, or broader supporting hardware. If you’re building a streetable 350, these kits cover front‑to‑back installation needs, from complete blower systems to essential brackets and oil lines.
Summary of selected products:
| Product | Brand | What It Is | Best For |
|---|---|---|---|
| Complete 6-71 Roots Supercharger Kit for SBC | Speedmaster | Complete bolt‑on blower kit with manifold, pulleys, belt, gaskets | Serious horsepower, street use |
| Speedmaster PCE154.1009 SBC Blower Crank Support Kit | Speedmaster | Billet bracket kit for blower support | Reliable mounting and alignment |
| GRCFUMO Alternator Bracket Kit for SBC 350 | Grcfumo | Adjustable aluminum alternator bracket kit | Clean install with proper belt alignment |
| Khaos Motorsports Coupler Isolator and Oil Kit | Khaos Motorsports | Coupler isolator plus oil kit for power adders | Upgrade for reliability of forced-induction hardware |
| Edelbrock E-Force Supercharger Assembly Kit for Corvette LS2 | Edelbrock | LS-based supercharger kit for a performance platform | Alternative blower option with proven tech |
Speedmaster Complete 6-71 SBC Supercharger Kit
This complete kit is designed to bolt onto standard‑deck SBC engines such as 265/283/305/307/327/350/383/400 families. It includes a Roots 6‑71 blower, intake manifold, snout, 50T/55T Gilmer pulleys, idler and bracket, a 3‑inch belt, crank pulley, dual‑carb adapter, and gaskets. Best for: enthusiasts seeking a straightforward, streetable power boost with a ready‑to‑install package. Limitations: verify rotating assembly compatibility for sustained race use and ensure carburetor/fuel systems are tuned for forced induction.
Key considerations:
- Boost potential: 45–55% horsepower gain is advertised under optimized conditions.
- Compatibility: fits standard SBC blocks and multiple cubic inches.
- Carburetor compatibility: dual‑carb adapter is included; carbs/fuel system sold separately.
Who it’s best for: street enthusiasts who want a turnkey, bolt‑on blower with a proven Roots design and strong support components. Why selected: it directly targets the SBC audience with a complete install kit and explicitly lists SBC compatibility.
Speedmaster SBC Blower Crank Support Bracket Kit
This billet crank support bracket kit is designed to reinforce blower mounting on Chevy 350 platforms, contributing to alignment stability under boost. Best for: builders who want stronger, dedicated support hardware to reduce belt slip and maintain blower timing. Limitation: kit components are shown in product images; verify exact components before purchase to ensure complete fitment with your blower setup.
Why selected: it complements a forced‑induction build by bolstering the blower drive system, making it a practical upgrade for reliability and longevity in a 350 SBC setup.
Khaos Motorsports Coupler Isolator and Oil Kit
Manufactured from premium nylon with a lifetime guarantee, this kit offers a coupler isolator and an oil kit upgrade for power adder components such as superchargers. Best for: owners seeking a durable isolator and oil upgrade to reduce vibration wear and improve system reliability. Caution: verify compatibility with existing blower configurations and oil routing on your setup.
Why selected: it targets a critical, often overlooked weakness in forced‑induction installs—coupler wear and oil delivery reliability—helping protect a 350 SBC blower system from common failures.
GRCFUMO Alternator Bracket Kit for SBC 350
This aluminum, chrome‑plated alternator bracket kit is designed for Chevy SBC 350 blocks and provides a direct replacement with precise fitment. Best for: builders seeking a sturdy, aesthetically pleasing upgrade that simplifies belt alignment and tensioning. Limitation: always confirm OE numbers and vehicle specs to ensure exact fitment for your engine bay layout.
Why selected: a clean, durable mounting solution is essential in forced‑induction builds to prevent accessory misalignment and belt slip, which is common in high‑boost SBC applications.
Dirty Dingo LS Billet Twin Turbo Oil Feed Kit
Note: This kit is designed for LS engines and turbo systems, not original SBC configurations. Best for: builders who already operate LS platforms and want a robust oil feed solution for twin turbo setups. Caution: not a direct SBC fit; verify engine family before purchasing.
Buying Guide: Key Considerations For a 350 Small Block Supercharger Build
Assess engine goals before selecting a kit. Decide if you want a complete blower package, supporting hardware, or an upgrade path for existing induction components.
- Engine compatibility: Confirm that the kit is designed for your specific SBC block and deck height. Some kits are universal but require adapters.
- Boost levels and drive system: Understand the pulley sizes, belt drive, and rotors to estimate safe boost ranges for street use.
- Fuel and ignition requirements: Forced induction demands precise fuel delivery and ignition timing. Plan for tuning and supporting fuel system upgrades.
- Installation scope: Some kits are truly bolt‑on; others need additional brackets, carb spacers, or carburetor adjustments.
- Reliability and components: Consider bracket quality, oil lines, couplers, and vibration isolation to prolong life under boost.
- Warranty and support: Check what is covered with each kit and whether vendor support is available for SBC installs.
Frequently Asked Questions
- What is the typical horsepower gain from a 6‑71 Roots blower on a Chevy 350?
– Gains are commonly reported in the 45–55% range under suitable tuning and supporting modifications; actual results vary with fueling, exhaust, and component quality. - Do I need a new carb or fuel system with a blower kit for SBC?
– Yes. Forced induction requires higher fuel delivery and proper metering; many kits assume additional carb/EFI and fuel upgrades. - Is a bracket kit essential for a blower setup on a 350 SBC?
– A solid bracket and mounting system reduces belt slip and keeps rotor timing precise, which helps reliability at higher boost. - Can I mix components from different brands for a SBC blower build?
– It’s possible but requires careful compatibility checks, especially for pulleys, belts, and mating surfaces to ensure proper fit and timing. - Will a blower kit fit under a stock hood?
– It depends on the kit and engine bay space. Some setups require hood scoops or trimming, while others fit under stock hoods with careful routing.