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  1. #1
    Join Date
    Dec 2008
    Posts
    139

    Default No rear power valve.

    i have a Holley HP main body 750 Carb 134-300c. It came with 72/84 jets. I installed a rear metering block with no power valve. I want to use it on a 383 aluminum head modified motor. Flat top pistons,solid lift cam,6 inch rods,205 on the intake runners and cam at .584 lift. and has a long duration. I installed a rear metering block with no power valve. What is a good starting point for the jets ? Make them even front and back ? 4 to 6 Steps higher in the rear ? Leave them like they are ??

  2. #2
    Join Date
    Dec 2008
    Location
    thedirtysouth
    Posts
    4,005

    Default

    your jets on rear are what we normally run with no power valve , my range is between 80 and 86 , according to what the engine needs ,

  3. #3
    Join Date
    Oct 2017
    Posts
    1,363

    Default

    Power valve typically adds about 20%but that can very. Sounds like it didn't or shouldn't have had one to beggin with from your jetting

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