Answering the top buyer questions, this guide highlights the best throttle body spacer bolts and adapters that fit popular LS engine setups. Ideal for performance-oriented builders, daily drivers needing a simple spacer upgrade, and enthusiasts swapping throttle bodies across LS platforms. The table below compares the five most relevant products to help you choose quickly.
| Product | Vehicle Applications | Best For | Notes |
|---|---|---|---|
| 551513 LS Throttle Body Adapter 92mm | LS1 3-bolt to LS3 4-bolt DBW | Wider throttle body with DBW systems | Compatible across multiple LS families |
| GM Genuine Parts 11611133 Throttle Body Bolt | General LS fits | OEM reliability | Standard bolt for factory-style installs |
| 551513 LS Throttle Body Adapter 92mm (Billet) | LS1 to LS3 DBW, wide compatibility | Premium billet option | Suitable for performance builds |
| HiSport LS Drive By Wire Throttle Body Adapter 551567 | 4-bolt to LS1 3-bolt TB, DBW | Complex swaps and DBW conversions | Extensive compatibility list |
| 200-617 Throttle Body Spacer (Chevrolet 4.8/5.3/6.0L) | Chevrolet 4.8L–6.0L 2007–2013 | Spacer-based tuning | Spacer option with different bolt kits |
551513 LS Throttle Body Adapter 92mm
This 92mm adapter is designed to connect LS1 3-bolt intakes to a 4-bolt LS3 throttle body in DBW configurations. Best for builders upgrading to a wider throttle body without a full manifold swap. Suitable for LS engines including LM7, LR4, LQ4, LQ9, LS6, and LSX variants in 4.8L–6.0L displacements. Choose this if you need DBW compatibility and a straightforward bolt-on adapter.
Best for: Builders performing a DBW swap or throttle body upgrade on LS1-to-LS3 paths. Better for: users seeking a reliable, broad-compatibility adapter. Avoid this if: you are not running a 92mm DBW setup.
GM Genuine Parts 11611133 Throttle Body Bolt
OEM throttle body bolts from GM Genuine Parts provide factory-fit and thread engagement for LS applications. Best for: customers prioritizing original equipment reliability and straightforward bolt-on installs. Better for: ensuring correct torque and compatibility with GM throttle bodies. Caution: ensure bolt length matches your specific manifold and TB combination to avoid misalignment.
551513 LS Throttle Body Adapter 92mm (Billet)
This billets version mirrors the standard 92mm adapter but uses premium metal for reduced flex and enhanced durability under high-heat conditions. Best for: performance builds where rigidity matters. Better for: those pursuing slight weight savings and a premium finish. Caution: billet parts may have tighter tolerances; verify fitment with your exact manifold and TB pairing.
HiSport LS Drive By Wire Throttle Body Adapter 551567
HiSport’s 551567 adapter adds DBW compatibility for a broad range of 4-bolt to LS1 3-bolt configurations. Best for: enthusiasts performing wide compatibility swaps across LS2, LS6, LH6, LFA, and more. Better for: users needing a versatile DBW transition. Caution: verify that your TB and manifold are DBW-capable to avoid misfit.
200-617 Throttle Body Spacer (Chevrolet 4.8/5.3/6.0L)
This spacer is designed for Chevrolet 4.8L, 5.3L, and 6.0L engines from model years 2007–2013. Best for: buyers aiming to increase intake air flow or adjust throttle response with a spacer. Better for: simple spacer-based tuning rather than complex TB swaps. Caution: spacer height and bolt length must be compatible with your manifold and TB assembly to avoid seal or clearance issues.
Buying Guide: Key Purchase Considerations
- What engine and bolt pattern do you have? Ensure the adapter matches your LS generation (LS1 3-bolt, LS3 4-bolt, etc.).
- DBW vs. traditional cable throttle: If your vehicle uses DBW, prioritize DBW-compatible adapters or spacers.
- Material quality: Billet adapters offer stiffness and durability, while OEM bolts emphasize compatibility and torque accuracy.
- Spacer height and throttle body size: A larger spacer or 92mm adapter can affect airflow and calibration; confirm clearance with fuel rails and intake plenums.
- Warranty and origin: OEM GM parts provide factory specifications; aftermarket billets and brands offer performance-focused benefits.
Additional Considerations
- Torque specifications: Use correct torque to avoid warping or stripped threads. Consult manufacturer guidelines specific to your parts.
- Installation sequence: Follow a clean, evenly spaced tightening pattern to ensure a proper seal and alignment.
- Future upgrades: If you anticipate future throttle body changes, choose adapters that maximize cross-compatibility across LS generations.
Frequently Asked Questions
- What is a throttle body spacer bolt, and why use it?
A spacer bolt helps secure a throttle body and adapter when upgrading to a different bolt pattern or increasing throttle body size. - Can I mix OEM bolts with aftermarket adapters?
Compatibility varies; use manufacturer-recommended fasteners to avoid alignment or torque issues. - Is a billet adapter worth it?
Billet adapters offer improved stiffness and durability, which can benefit high-performance setups, but may cost more. - Will a 92mm adapter fit my LS engine?
It depends on your manifold and throttle body combination; verify bolt pattern and DBW compatibility. - Do I need a spacer for performance gains?
Spacers can alter airflow and throttle response; assess whether your goals require spacer height and airflow tuning rather than a direct bolt swap. - Which option is best for a DBW swap?
Choose an adapter explicitly listed for DBW configurations to ensure proper sensor control and throttle calibration.