The stock throttle body size for most 5.7 Hemi engines is 90 millimeters in diameter.
Beyond this baseline, the question gets into year-by-year variations, optional performance packages, and how the bore size affects airflow and tuning. This article lays out the typical stock size, what that implies for the 5.7 Hemi, and how to confirm the exact size for your specific vehicle.
Stock throttle body size
Before examining the common size and its implications, it helps to summarize what most owners will encounter as the factory specification and how it relates to performance potential.
- Stock bore: 90 mm (approximately 3.54 inches) in the typical 5.7 Hemi applications produced for many model years.
- Aftermarket options: Performance-focused throttle bodies are commonly available in 92 mm, 95 mm, 102 mm, and 105 mm sizes to increase peak airflow at higher RPMs; larger bores can affect low-end throttle response and driveability.
- Variations by year or package: While 90 mm is the standard for many 5.7 Hemi builds, occasional revisions or specific performance packages may use different sizes; always verify against your vehicle’s exact VIN and parts catalog.
In short, 90 mm is the baseline stock size for the 5.7 Hemi, with popular aftermarket upgrades expanding up to 105 mm for specialized builds. Always confirm your exact part for precise compatibility.
How to verify the exact size for your vehicle
To be sure you have the correct throttle body size for your specific 5.7 Hemi, follow these verification steps.
- Consult the vehicle’s service manual or the official Mopar parts catalog for your exact VIN to confirm the stock throttle body size.
- Inspect the throttle body itself for sizing information: look for a bore size stamp or a part number that can be cross-referenced with a parts database.
- If disassembly is feasible, measure the bore diameter with calipers when the throttle is in the closed position to determine the actual bore size.
- Compare the measured or listed size to the common stock size (90 mm) and any aftermarket bore sizes you are considering for upgrades.
- If you are upgrading, ensure compatibility with the intake manifold, throttle-by-wire calibration, and PCM tuning requirements.
Accurate verification helps prevent mismatched parts and ensures proper fitment and performance expectations.
Summary
The stock throttle body on most 5.7 Hemi engines is 90 millimeters in diameter, forming the baseline for airflow and tuning. While aftermarket upgrades commonly move to larger bores (92–105 mm), confirming the exact size for your specific vehicle via VIN, manual, or part number is essential before any replacement or performance modification.