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Speedmaster Throttle Body Adapter GM LS1 (3-Bolt) to GM LS1(4-Bolt)

Speedmaster PCE539.1001


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Speedmaster Throttle Body Adapter GM LS1 (3-Bolt) to GM LS1(4-Bolt) $37.10
Throttle Body Adapter
  • GM LS1 (3-Bolt) to GM LS1(4-Bolt)
  • Thickness: 0.5"

  • Speedmaster PCE539.1001 Details

    Throttle Body Adapter

    Allows a 4-bolt throttle body to be installed in an earlier 3-bolt patter intake manifold.


    Manufacturer's Part Number:

    Speedmaster's EFI Throttle Body System is CNC-machined from heat-treated 601 cast aluminum and designed to support up to 1000 hp. This EFI Throttle Body System contains 50mm IDA style throttle body openings that provide you with superior idle characteristics and throttle response; while improving emissions and economy through tight air/fuel ratio control. Speedmaster has engineered the EFI throttle body system with an all-in-one linkage set that incorporates throttle stops, idle controls, lever arms and joiner/balancer. With a single screw adjustment, you can easily calibrate the front to rear throttle shafts. The bell crank contains a fully indexable eccentric cable pulley for good slow speed drivability and full throttle geometry. Each bore contains precision machined butterflies with closer tolerance measurements, that are secured to centerless ground brass shafts with split screws.

  • Fitted with bearings that eliminate axial shaft movement
  • Housing to shaft lip seals behind bearings for extra sealing under high vacuum
  • Idle by pass air bleed screws for super smooth idle and to aid emissions tuning
  • O-ring seals on lower mounting faces

  • Some parts are not legal for use in California or other states with similar laws / regulations