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Thread: Old School EFi

  1. #16
    Carb and Points!
    Join Date
    May 2024
    Posts
    1
    Looking for some guidance. I had a plan but now I am second guessing myself. I have a 91 Chevy K2500 factory 7.4 NV4500 truck. Timing chain broke last year and the truck has unknown mileage so when I dropped it at the machine shop I figured I might as well just rebuild instead of trying to do the bare minimum. As usually happens when ‘it will only cost a little more to XYZ’ is uttered I now have a 489 stroker with Brodix Race Rite 270 heads being assembled and just about ready to go on the dyno. I was hoping to stick with TBI and had mine ported by SPR along with a ported Edelbrock TBI intake. The internal regulator has been deleted in favor of an Aeromotive adjustable regulator, have an Aeromotive in tank 340lph fuel pump to help feed the beast etc. My plan was to go with Dynamic EFI conversion but now I am getting nervous and wondering what limitations I am going to run into and contemplating just tossing a Brawler carb on it so I can get my truck back on the road while I get things sorted. As it might be a factor the cam is a small 218/226@ .050 with .585 lift hydraulic roller. Thoughts?

  2. #17
    Super Moderator dave w's Avatar
    Join Date
    Feb 2011
    Posts
    6,368
    Quote Originally Posted by 91K2500Beast View Post
    Looking for some guidance. I had a plan but now I am second guessing myself. I have a 91 Chevy K2500 factory 7.4 NV4500 truck. Timing chain broke last year and the truck has unknown mileage so when I dropped it at the machine shop I figured I might as well just rebuild instead of trying to do the bare minimum. As usually happens when it will only cost a little more to XYZ is uttered I now have a 489 stroker with Brodix Race Rite 270 heads being assembled and just about ready to go on the dyno. I was hoping to stick with TBI and had mine ported by SPR along with a ported Edelbrock TBI intake. The internal regulator has been deleted in favor of an Aeromotive adjustable regulator, have an Aeromotive in tank 340lph fuel pump to help feed the beast etc. My plan was to go with Dynamic EFI conversion but now I am getting nervous and wondering what limitations I am going to run into and contemplating just tossing a Brawler carb on it so I can get my truck back on the road while I get things sorted. As it might be a factor the cam is a small 218/226@ .050 with .585 lift hydraulic roller. Thoughts?
    The Brawler Carburetor is low cost and simple. A very good option for the budget.

    Someone with intermediate to advanced EFI skills will clearly demonstrate how the Brawler Carburetor has earned the nickname "Toilet Bowl"

    TBI on a 489 Stroker is a marginal performance plan. In my humble opinion the TBI is a better option than a "Toilet Bowl"

    Seeing how you have a manual transmission, I really like the plan to go with Dynamic EFI.

    Using Port Injection (one injector per cylinder) is my recommended performance option. Dynamic EFI supports Port Injection too.

    The Vortec 454 Port Injection System is an option. The Edelbrock BBC Port Injection System is also an option. Buyer beware of the injectors required for the Edelbrock BBC Port Injection System!

    DSCN2190.jpg

    DSCN2188.jpg

    454 MPFI Engine Stand.jpg


    https://www.ebay.com/itm/27643816820...Bk9SR5bsvKf4Yw
    454 Port Injection.jpg

  3. #18
    Fuel Injected!
    Join Date
    Jan 2021
    Location
    Deep in the heart of Texas
    Posts
    74
    http://www.gearhead-efi.com/Fuel-Inj...6&d=1716953302
    Impressive little rig. I like the ingenuity.

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