Bill Smith
Founder, 1929-2014
Speedy Bill
Since 1952
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America's Oldest Speed Shop ®

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Percy's High Performance, Inc. was started in 1995 by racers for racers, with a vision of developing unique, problem solving products for the racing and high performance automotive aftermarket. Since then Percy's has developed many products that have done just that. Percy's has patents on most of the products that we make and continue to lead the way in cutting edge technology and new concepts.

"Percys" Page 1 of 1

  • Percy's 15013 Extened Dual Feed Carburetor Fuel Line-Holley 4150 -8 AN
    Percy's 15013 Extened Dual Feed Carburetor Fuel Line-Holley 4150 -8 AN
    (Part #25915013)
    x
                This extended length dual inlet carburetor fuel line from Percy's compensates for the extra length between fuel bowls when using Percy's Adjust-A-Jet adjustable metering blocks. Dual feed fuel log features -8 AN anodized aluminum fittings and works with Holley 4150 style Double Pumper carburetors.
            
  • Percy's 15001 Adjust-A-Jet Metering Block, Street/Strip
    Percy's 15001 Adjust-A-Jet Metering Block, Street/Strip
    (Part #25915001)
    x
                

    Imagine adjusting your Holley carburetor's fuel metering without removing the fuel bowls!

    Percy's Adjust-A-Jet fits between the carb body and metering block and has needle valves that let you infinitely adjust the effective fuel jetting - even with the engine running.

    You'll tune more quickly and eliminate fuel spills. For gas street/strip models.   

  • Percy's 15007 Adjust-A-Jet Metering Block, Alcohol Secondary
    Percy's 15007 Adjust-A-Jet Metering Block, Alcohol Secondary
    (Part #25915007)
    x
                

    Imagine adjusting your Holley carburetor's fuel metering without removing the fuel bowls!

    Percy's Adjust-A-Jet fits between the carb body and metering block and has needle valves that let you infinitely adjust the effective fuel jetting - even with the engine running.

    You'll tune more quickly and eliminate fuel spills. For alcohol circle track models.

  • Percy's 66021 Seal-4-Good Reusable Base Plate Gasket
    Percy's 66021 Seal-4-Good Reusable Base Plate Gasket
    (Part #91011105)
    x
                Advanced EMR polymer insures reusability. Will not stick like ordinary paper gaskets. Allows quicker carburetor removal and replacement.  Gasket is 0.0640" thick.
            
  • Percy's 15006 Adjust-A-Jet Metering Block, Alcohol Primary
    Percy's 15006 Adjust-A-Jet Metering Block, Alcohol Primary
    (Part #25915006)
    x
                

    Imagine adjusting your Holley carburetor's fuel metering without removing the fuel bowls!

    Percy's Adjust-A-Jet fits between the carb body and metering block and has needle valves that let you infinitely adjust the effective fuel jetting - even with the engine running.

    You'll tune more quickly and eliminate fuel spills. For alcohol circle track models.

  • Percy's 15004 Adjust-A-Jet Metering Block, Circle Track, Gas Primary
    Percy's 15004 Adjust-A-Jet Metering Block, Circle Track, Gas Primary
    (Part #25915004)
    x
                

    Imagine adjusting your Holley carburetor's fuel metering without removing the fuel bowls!

    Percy's Adjust-A-Jet fits between the carb body and metering block and has needle valves that let you infinitely adjust the effective fuel jetting - even with the engine running.

    You'll tune more quickly and eliminate fuel spills. For gas circle track models.   

  • Percy's 01201 Wheelrite
    $89.99
    Product Rating: 4.00 Stars
    Percy's 01201 Wheelrite
    (Part #91065475)
    x
                Nifty tool bolts to your brake rotor or drum and allows you to determine what width, diameter and offset wheels will fit your car. It will simulate 6" to 11" or more width and 15" to 30" height.  Fits four or five lug bolt patterns from 4" to 5.5".

    Make your selections, then give it a spin!  Check clearance at every point in the rotation. 
  • Percy's 15012 Extened Dual Feed Carburetor Fuel Line-Holley 4150 -6 AN
    Percy's 15012 Extened Dual Feed Carburetor Fuel Line-Holley 4150 -6 AN
    (Part #25915012)
    x
                

    This extended length dual inlet carburetor fuel line from Percy's compensates for the extra length between fuel bowls when using Percy's Adjust-A-Jet adjustable metering blocks. Dual feed fuel log features -6 AN anodized aluminum fittings and works with Holley 4150 style Double Pumper carburetors.

  • Percy's 15005 Adjust-A-Jet Metering Block, Gas Secondary
    Percy's 15005 Adjust-A-Jet Metering Block, Gas Secondary
    (Part #25915005)
    x
                

    Imagine adjusting your Holley carburetor's fuel metering without removing the fuel bowls!

    Percy's Adjust-A-Jet fits between the carb body and metering block and has needle valves that let you infinitely adjust the effective fuel jetting - even with the engine running.

    You'll tune more quickly and eliminate fuel spills. For gas circle track models.

  • Garage Sale - Percy's 15005 Adjust-A-Jet Metering Block, Gas Secondary
    Garage Sale
    Garage Sale - Percy's 15005 Adjust-A-Jet Metering Block, Gas Secondary
    (Part #UP42332)
    x
                

     This metering block is garage sale priced because it is the block and one gasket only, what you see is what you get.

     NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS 

    Imagine adjusting your Holley carburetor's fuel metering without removing the fuel bowls!

    Percy's Adjust-A-Jet fits between the carb body and metering block and has needle valves that let you infinitely adjust the effective fuel jetting - even with the engine running.

    You'll tune more quickly and eliminate fuel spills. For gas circle track models.

  • Garage Sale - Primary Adjust-a-Jet Metering Block
    Garage Sale
    Garage Sale - Primary Adjust-a-Jet Metering Block
    (Part #UP36499)
    x
                

    Imagine adjusting your Holley carburetor's fuel metering without removing the fuel bowls!

    Percy's Adjust-A-Jet fits between the carb body and metering block and has needle valves that let you infinitely adjust the effective fuel jetting - even with the engine running.

    You'll tune more quickly and eliminate fuel spills. For gas circle track models.    
     
    This is Garage Sale priced because it does not include a main body gasket.
     
    NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS