Direct answer: choose stainless steel screws for LS engines to ensure durability, a bolt kit for drive-by-cable throttle bodies, and airline-gasket ready options for carburetor idle screws. This guide compares five top Amazon options that fit LS1, 5.3L, 5.7L, 6.0L, and Harley applications, helping you pick the right screws for TPS/IAC installations, idle stability, and long-term reliability.
Who should read this: if you’re upgrading or repairing idle air control (IAC) and throttle position sensor (TPS) hardware on GM LS engines or certain Harley models, these picks cover direct OEM replacements, high-strength stainless builds, and gasket-ready idle screws. A quick buying table follows to summarize the best-fit picks.
| Product | Best For | Notes |
|---|---|---|
| Michigan Motorsports LS1 TPS & IAC Stainless Steel Bolts | LS engine owners needing durable, accurate fasteners | Stainless steel, direct replacement |
| ICT Billet Bolt KIT ONLY for LS TPS & IAC | Drive-by-Cable LS engines | Bolt kit only, compatibility with multiple LS variants |
| 16-27 Air Idle Mixture Screw Cork Gaskets Replacements | Carbureted idle adjustments | Gasket replacements for Holley etc. |
| Car Idle Air Control Valve 2x Screws for Harley | Harley idle control valve replacement | Specific Harley models and part numbers |
| Michigan Motorsports LS1 Throttle Position Sensor & Idle Air Control Bolts (Black) | LS1 bolt kit with black finish | OEM-replacement grade |
Michigan Motorsports LS1 TPS & IAC Stainless Steel Bolts
These stainless steel bolts are a precision fit for LS engines, designed specifically for LS1, 5.3L, 5.7L, and 6.0L applications. They provide a secure and exact fit for TPS and IAC valve installations, offering corrosion resistance and durability in high-heat environments. They are a direct replacement for factory bolts, reducing the risk of stripped fasteners during TPS and IAC work.
Best for: LS engine owners performing TPS/IAC work who want a reliable, corrosion-resistant fastener. Choose this if you value OEM-style fit with stainless steel durability and straightforward replacement.
Caution: Ensure correct bolt length for your specific throttle body and IAC valve mounting pattern to avoid over-tightening or misalignment.
ICT Billet Bolt KIT ONLY for LS TPS & IAC
Idle Air Control Valve and TPS bolt kit for GM LS engines with drive-by-cable throttle bodies. This kit provides fasteners to install and secure the TPS and IAC valves. It is a practical option when just the bolts are needed to complete a throttle body upgrade or a maintenance refresh.
Best for: Builders or technicians upgrading LS drive-by-cable throttle bodies who need a dedicated bolt kit. Better for: ensuring a complete set of mounting hardware is available during a swap.
Caution: Verify compatibility with your exact LS variant, as some engines or throttle bodies may require different lengths or thread pitches.
16-27 Air Idle Mixture Screw Cork Gaskets Replacements
Idle mixture screws and cork gasket replacements designed for Holley, QFT, AED, CCS idle screws across 2- or 4-barrel carburetors. These gaskets help ensure a proper seal around idle mixture screws, aiding stable idle and reducing air leaks that can affect idle mixture calibration.
Best for: Carbureted engines needing replacement gaskets for idle screws. Choose this if you operate Holley or similar carburetors and must maintain proper idle calibration.
Caution: Verify gasket compatibility with your carburetor model and tune to avoid leaks that could alter idle quality.
Car Idle Air Control Valve 2x Screws for Harley
Harley-specific idle air control valve screws, compatible with various Harley models from 2001-2005 and Sportster/Softail/ Touring lines. This listing emphasizes stabilizing idle speed and preventing stalling by ensuring the idle control valve operates reliably, with materials designed for durability in motorcycle engines.
Best for: Harley-Davidson riders needing reliable IAC valve mounting screws. Choose this if you’re focusing on stable idle in older Harley EFI setups.
Caution: Confirm exact Harley model compatibility and part numbers (OE 27628-01/27628-01A) before ordering to avoid fitment issues.
Michigan Motorsports LS1 TPS & IAC Bolts – Black
Direct OEM replacement bolts designed to replace the TPS and IAC bolts on LS1 engines. The black finish provides a distinct look while maintaining the same fit and function as the stock hardware. These bolts work across multiple GM LS1-equipped models, including various Camaro and Corvette years.
Best for: LS1 enthusiasts seeking OEM-style fit with a black finish. Choose this if you want visually distinct bolts that still deliver reliable performance.
Caution: Check bolt length and thread pitch to ensure compatibility with your throttle body and IAC valve hardware.
Buying Guide: Key Considerations for Idle Valve Screws
- Confirm your engine family (LS1, 5.3L, 5.7L, 6.0L) or motorcycle model to ensure correct bolt size and threading.
- material and finish: Stainless steel offers corrosion resistance for engine bays; black finishes provide aesthetics and may aid in heat tolerance.
- OEM vs. aftermarket: Direct OEM replacements reduce risk of misfit; aftermarket bolt kits can simplify installation during upgrades.
- installation context: For drive-by-cable throttle bodies, ensure bolts are designed for the specific TPS and IAC mounting pattern.
- gasket and seal considerations: Idle screws and cork gaskets require proper sealing to prevent idle instability caused by air leaks.
- model-specific cautions: Harley models and Holley/Quadrajet-style carbs have unique mounting requirements; verify OE numbers and compatibility before purchase.
FAQ
- Are stainless steel bolts necessary for IAC/TPS installations? Stainless bolts offer superior corrosion resistance and durability in high-heat engine environments, reducing the risk of galling or rust over time.
- Can I use any IAC bolt kit on any LS engine? No. Verify the bolt pattern, length, and thread pitch for your specific LS variant and throttle body configuration.
- What is the benefit of a dedicated bolt kit vs. individual bolts? A bolt kit ensures you have all required fasteners for a complete TPS/IAC install, reducing the chance of missing hardware during assembly.
- Do these screws affect idle performance? Properly sized and installed screws help maintain correct idle airflow and sensor mounting, which can stabilize idle and sensor readings when paired with the correct IAC valve and throttle body.
- Should I replace gaskets when replacing idle screws on carburetors? Replacing idle mixture gaskets helps maintain a proper seal and idle calibration, especially on Holley/QFT/CCS carburetors.
- Is Harley IAC hardware different from automotive LS hardware? Yes. Harley idle control components often use different mounting patterns and OE numbers; verify part compatibility with your model.