Rapid Jet Quick Change Metering Block




Product Description

BLP RapidJet is a unique metering block application which allows the user quick and easy access to change not only jets but calibrations in just a few moments. By just removing the inserted emulsion tube you can change jets, emulsion stack, idle feed restrictions in one single process.
Simply screw in the removal tool and remove the tube in just seconds, while the motor is still idling.
If you lose this, a bowl screw has the same threads. So you're never without a removal tool.
Pull As you can see, the jet is at the end of the cartridge.
You can change the jet in your hand, or pop the cartridge in upside down into the metering block makes it easier to work on. It's designed to work that way.
Holley® carburetors need no modification need no modifications. One of the beauties of the design.
The cartridge carries the emulsion holes, the power valve restriction, and the idle feed restriction.
You decide what size you'd like each restriction.
You decide how many emulsion holes, where they're located, and their size.
(IE: two on top, two on the bottom, three along the center.)
You can change the entire fuel curve by simply changing the cartridge.
Blocks sold individually and are stock calibrated with the NVH3 calibration, which is as follows:
N= Idle fuel restriction .036
V= Power Valve Channel Restriction .060
H= Emulsion Hole size .029
3= number of emulsion holes (3).
Blank emulsion tubes available for you to make your own combinations, tubes spot drilled to assist in drilling and modifying to your specific needs.
Includes 2 emulsion/jet cartridges, o-rings.
Works with standard Holley 2-circuit metering block gaskets.
Jets not included, in this assembly, main jets must be installed to use.
uses only genuine Holley® main jets.


  • Model: 51241RJ
  • Shipping Weight: 0.055lbs
  • Manufactured by: BLP


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This product was added to our catalog on Friday 20 October, 2017.