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Thread: Part Number for Mass Airflow Sensor Connector & Sensor

  1. #1

    Default Part Number for Mass Airflow Sensor Connector & Sensor

    I have a new GM LS3 Crate Engine. I have purchased the "Terminator X Max" and "Air Inlet Kit for LS-Based Crate Engine":

    Is this the correct adapter that I need to purchase? Holley EFI LS Main Harness to LS3-style MAP Sensor Adapter PART# 558-416:

    And would this be an appropriate Mass Airflow Sensor?
    Thanks in advance, Bobby

  2. #2
    Join Date
    Dec 2009


    All Holley EFI systems are Speed Density EFI. They use a MAP sensor, not a MAF sensor. Which Holley Terminator X EFI system are you looking at?
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  3. #3


    Sorry for the confusion. The following is what I have already purchased:
    New Gm Crate Engine LS3 430 HP #19370416
    Holley Terminator X MAX W/ Trans Control and DBW 58x/4x #550-928

    1) I have two connectors that I can not plug in? The MAP Sensor Connector does not appear to be able to plug into the sensor (image below).
    2) The other connector I can not find a place to plug in is the MAT Sensor Connector?

    Here is where I am with the project. Sometimes I feel like I'm a little over my head, so I put down the wrenches and go off to get refocused and do more research. All the main swap parts are Holley and have been really happy with how everything is going together.

    This is what I started with.

  4. #4


    You need to use the Holley 558-416 MAP adapter harness. Then for the MAT/IAT use the Holley 534-220 sensor in your intake air tube. -Greg

  5. #5


    Thanks, I have both on order and should arrive later today.

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