Unrivaled Customer Service
And Expert Tech Advice!  
Same Day Shipping Before 11 PM ET
My Cart
Shop By Vehicle
Shop By
Close Menu
Shop By Vehicle
Top Categories
All Categories

Top Categories

All Categories

Free Catalog
E-Mail Signup
My Account
Track Order
Gift Certificates

FAST 54103

Big Mouth Throttle Body 102mm

FAST 54103


made in usa
jegs shipping
FREE Shipping
Easy Returns
Easy Returns
Lowest Price Guarantee
Lowest Price Guarantee
FAST 54103 Big Mouth Throttle Body 102mm $566.99
Big Mouth Throttle Body
  • 102mm
  • Billet
  • With TPS / IAC Sensors
  • Fits LSX & LSXR Intake Manifolds

  • FAST 54103 Details

    Big Mouth Throttle Bodies


    Gaskets Included
    Hardware Included
    Venturi Quantity
    IAC Motor Included
    Injectors Included
    Sold individually
    Throttle Body Style
    Multi-port injection, MPI
    TPS Sensor Included
    Venturi Diameter (mm)
    Throttle Body Finish
    Clear anodized
    Throttle Body Material
    Billet aluminum
    Manufacturer's Part Number:

    FAST's Big Mouth Throttle Bodies for the LSX 92mm and LSXR/LSXRT 102mm Intake Manifolds increase airflow through a series of innovative design changes and an enlarged throttle opening. These throttle bodies offer increased throttle blade thickness to eliminate deflection commonly found with other throttle bodies, especially those in boosted applications. A smoother operating offset blade pivot improves throttle response, and a beefed up linkage and dual throttle spring mechanism ensure total throttle control. Constructed from billet aluminum, the FAST Big Mouth 92mm Throttle Body will deliver bolt-on GM Gen III (LS1/2/6) horsepower, while the 102mm version is designed to maximize performance upgrades on all Gen III and Gen IV engines with cable driven throttle bodies.

    Also available for LS, Ford Coyote and Chrysler Hemi applications are the Big Mouth LT Throttle Bodies, new and improved versions of the original Big Mouth Throttle Body. With a 92mm throttle bore for LS and 87mm for the Ford Coyote and Chrysler Hemi, each one features black-wrinkle powder coating and all of the same features as the original.


    • Designed to work with FAST LSX 92mm & LSXR 102mm Intake Manifolds
    • Better airflow than OEM or aftermarket 90mm units due to enlarged throttle opening and modified internal design
    • Dual spring mechanism and beefed up linkage for total throttle control
    • Increased thickness of both the throttle blade and the shaft resists deflection, especially in boosted applications
    • Offset blade pivot allows for smoother operations & significantly improves throttle response
    • Big Mouth LT Throttle Bodies available for LS, Ford Coyote and Chrysler Hemi applications

    Will this work on a different intake manifold other than the lsxr manifold?

    Asked by: Mattc18c
    Thank you for your question. This will bolt up to any intake that is bore to receive a 102mm and uses a 4 bolt flange.
    Answered by: Seth W
    Date published: 2018-01-19
    • y_2018, m_3, d_18, h_5CST
    • bvseo_bulk, prod_bvqa, vn_bulk_2.0.7
    • cp_1, bvpage1
    • co_hasquestionsanswers, tq_1
    • loc_en_US, sid_10001_10001_2107568, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_jegs