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Thread: 4BBL TBI rebuild kit?

  1. #1
    Join Date
    May 2015
    Location
    Adrian, MI
    Posts
    10

    Default 4BBL TBI rebuild kit?

    I've searched through Holley's website, can't seem to find a TBI rebuild/renew kit that's for the Commander 950/Avenger systems. Only the old Pro-Jection.
    https://www.holley.com/products/fuel...ts/parts/503-6

    The correct injector o-rings:
    https://www.holley.com/products/fuel...s/parts/508-19

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    21,430

    Default

    The Pro-Jection TBI unit is the same, except for the newer Delphi TBI fuel injectors (if you don't have the older B2 injectors). So it looks like you've found the kits you need.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 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
    Join Date
    May 2015
    Location
    Adrian, MI
    Posts
    10

    Default

    Here's what I got back from Holley. I asked before making this post.

    503-6 was added with both style injector o-rings. 503-6 will have the correct o-rings. If you just need the o-rings, then 508-19 will do the job. Old picture will not show new style injectors.
    Sincerely, Woody
    Holley EFI Support

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