Best 350 Small Block Turbo Upgrades for Chevy
Selecting the right parts for a 350 small block with turbo ambitions involves balancing exhaust flow, turbo support components, and reliable transmission integration. This guide highlights five practical upgrades that align with common 350 small block turbo builds, from header assemblies and speedometer solutions to pan gaskets and kickdown conversions. Each option offers durability and compatibility with typical V8 turbo setups, aiding performance, reliability, and ease of installation for enthusiast shops and DIY builders alike.
| Product | Brand | Key Benefit |
|---|---|---|
| BBC Big Block FOR Chevy V-Band 3.5” SS turbo headers PAIR Stainless Steel | PHAB | High-flow 2.25″ primaries with 3.5″ V-band outlet for turbocharged small blocks |
| Fits TH350 Transmission Kickdown Cable Delete Plug | Generic | Direct replacement for kickdown cable with simple install |
| Vkinman TH350 Speedo Housing with Plus Extra O-Ring | Vkinman | Leak-free, billet aluminum block-off for a clean TH350 look |
| 93102 Transmission Oil Pan Gasket Fit for GM Turbo 350 | JIOTAR | Steel-reinforced, high-durability gasket for reliable sealing |
| Noteflora CNC Machined Aluminum Speedometer Block Off Tool For TH350 | Noteflora | CNC machined block-off with O-ring for a precise, tidy install |
PHAB BBC Big Block Turbo Headers
PHAB provides BBC V-band stainless manifolds with 2.25″ primaries and a 3.5″ V-band outlet. Although designed for big-block use, their V-band and large-diameter outlet make them attractive for turbo setups that aim to maximize exhaust flow and reduce turbocharger backpressure on small-block builds adapted with appropriate adapters. The stainless construction supports heat management and corrosion resistance, while the 3.5″ outlet supports larger turbocharger housings and downpipe configurations. For turbocharged 350 builds that require robust exhaust manifolds, these headers offer a high-flow path capable of supporting increased boost and horsepower targets. Installation may require grinder clearance and proper header-tube routing to prevent interference with steering and chassis components.
TH350 Kickdown Cable Delete Plug
This 6061 aluminum kickdown cable delete plug provides a straightforward, durable replacement for the factory kickdown cable. In turbo-equipped 350 builds, removing the kickdown linkage can reduce mechanical complexity and potential routing conflicts. The plug-and-play design supports quick swaps and reduces potential wear points around the throttle linkage. Pros include a clean engine bay appearance and fewer cable-related failures in high-vibration environments. Consider ensuring compatibility with your transmission controller and confirming that the removal aligns with your transmission calibration and shift performance goals.
Vkinman Speedo Housing Plus O-Ring Kit
Designed for TH350 transmissions, this CNC-machined billet aluminum speedometer housing includes an extra O-ring and metal seal kit to prevent leaks. A clean speedometer block-off upgrade minimizes port leaks and maintains appearance under the hood, especially in turbo setups where additional heat and vibration can impact fittings. The billet construction provides durable, precise tolerances and a finished look that complements performance-focused builds. This part is best paired with a complementary dash or gauge setup to maintain accurate readouts where needed or to achieve a streamlined, water-tight transmission housing.
93102 Transmission Pan Gasket
The 93102 gasket is designed for GM Turbo 350 transmissions, delivering a steel-reinforced seal to prevent transmission fluid leaks. In turbocharged builds, maintaining consistent oil level and pressure is critical for drivetrain reliability. The gasket’s steel shim and high-quality rubber combination resist bending and cracking, offering robust durability beyond basic cork or rubber alternatives. When choosing a pan gasket for performance applications, consider the pan material, torque specifications, and the presence of any integrated oil return passages that may influence gasket selection and installation torque.
Noteflora CNC Machined Speedometer Block Off
This Noteflora block-off is CNC machined from billet aluminum and designed for TH350 Turbo 350 transmissions. It provides a precise, clean delete port for the speedometer cable, reducing clutter and improving the overall appearance of the transmission area. The kit includes an O-ring seal to ensure a tight, leak-free fit. For turbo setups where the speedometer may be redirected or eliminated, this tool helps maintain a professional, finished under-hood look while safeguarding against moisture or oil intrusion around the port.
Buying Guide: Key Purchase Considerations
- Compatibility: Verify the transmission model (TH350/Turbo 350), match to your build, and consider how turbo components affect mounting clearances and heat management.
- Material and Durability: For headers and gaskets, prioritize stainless steel, billet aluminum, or reinforced seals to handle heat and vibration typical of turbocharged engines.
- Installation and Fitment: Some parts require additional adapters or precise torque specs. Review vehicle-specific fitment notes and consider professional installation if unsure.
- Leak Prevention: Seals, O-rings, and gaskets must resist oil and coolant exposure; selecting high-quality, properly torqued components reduces leak risks in high-boost environments.
- Aesthetics and Organization: Block-off plates and clean routing improve under-hood appearance and ease future maintenance, especially in turbo builds with multiple lines and fittings.
- Performance Considerations: Upgrades should align with your target horsepower, boost levels, and desired drivability. High-flow headers and efficient seals support reliable performance without sacrificing daily usability.
- Cost and Availability: Some items may be niche; compare brands, return policies, and compatibility notes to balance cost against long-term reliability.