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Thread: 504-1 Pro-Jection can this work with new ECU?

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    Default 504-1 Pro-Jection can this work with new ECU?

    I found an old Holley Pro-Jection for sale, it says 504-1 on the box. Can this be used with the new controller?
    If so, what parts would be needed? Is it worth buying if it is cheap enough? It would need to support 600 hp in a 496 BBC.

  2. #2
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    Quote Originally Posted by greensahara View Post
    Can this be used with the new controller? If so, what parts would be needed?
    It can, but it won't be "plug & play" because the old fuel injection harness doesn't connect to the new Holley EFI harness.
    I'm not sure if it has the old style TPS sensor connection. It's probably a 1:1 ratio throttle linkage too, which is OK for a big block.
    You also have the option of converting to the new style Delphi injectors & injector pod, but that's very expensive.
    http://www.holley.com/550-600.asp (HP EFI ECU & Harness Kit)
    http://www.holley.com/558-304.asp (GM HEI Ignition Harness)
    https://www.holley.com/document/techlibrary_r10022.pdf (Pro-Jection 4D & 4Di manual)

    Is it worth buying if it is cheap enough? It would need to support 600 hp in a 496 BBC.
    It's hard to say. Is this the 900 CFM (1" throttle blades) TBI unit with four 85 lb/hr injectors?
    Are the fuel injectors in good condition? Is this the oldest unit without an IAC valve?
    May God's Grace Bless You

    '78 BRONCO: 508" stroker, TFS heads, Dominator MPFI & DIS, cold air induction, dual 3" exhaust/Magnaflow mufflers, 100HP progressive dry direct-port NOS, A/C, Lentech Strip Terminator wide-ratio AOD, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, custom traction bars, 4" lift, 35" mud tires

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