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Checkball and Checkweight Identification

This page includes all of the checkweight and checkballs that we carry and their common uses. If you are ever in doubt, compare the material and diameter size of the existing part to the replacement.

Don’t see your carburetor on the list? LET US KNOW!

90-21: 1/8″ Steel

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  • Holley 1940
  • 1904 & 1920 Holleys this check ball is used on the flat spot of the round accelerator pump diaphragm, under the sleeve.
  • Holley 4000 – fits in the pump well.
  • Aisan
  • Stromberg WW/WWC – goes under the discharge screw
  • Stromberg BX

90-12: 5/32″ Steel

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  • Carter YF – main discharge
  • Autolite Ford Motorcraft 4100 – secondary check ball
  • Rochester B – power valve
  • Rochester 4G

90-20: 5/32″ Aluminum

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  • Rochester 4G
  • Rochester B: pump inlet ball
  • Rochester 2G: bottom of pump well

90-146: 9/64″ Steel

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  • Carter YF 
  • Carter YH
  • Holley 2300
  • Edelbrock – pump check (discharge)

90-39: 5/32″ Nylon

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  • Holley 1904 vacuum check
  • Holley 4000 (under bottom of carburetor, remove brass screw to access)

90-19: 3/8″ Aluminum

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  • Rochester B pump discharge ball

90-158: 3/16″ Steel

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  • Autolite 4100, 2100, 2150: discharge, under the primary venturi screw
  • Rochester 4G
  • Holley 1940 discharge (you can use an extra check ball in place of the check weight when it’s missing)
  • Rochester 2G: main discharge
  • Stromberg AAV

17-16-2: .14″ square x .538″ long

  • Carter AFB
  • Carter WCFB
  • Carter WGD
  • Carter WCD

17-16-3: 5/16″ long

  • Carter AFB & AVS, but keep in mind that these 2 carburetors used 3 different check weights. This is the smallest of the three.
  • Carter WCFB
  • Carter WGD
  • Carter WCD
  • Carter YF, YFA

17-67 (used with a checkball)

  • Carter YF, YFA
  • Edelbrock
  • Weber

54-7: 0.17″ square x 0.7″ long

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  • Holley 94, 2100, 2110 & Ford AA-1
  • Rochester 4G, 4GC, 4 barrel carburetor

17-38: OD .205″ x .560 long

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  • Autolite 1100

17-66: 0.156″ OD x .517″ long

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  • Holley pump discharge weight

32-49: OD .097″ x .891″ long

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17-143: 3/8″ long

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  • Carter Thermoquad, TQ
  • Carter WCFB

17-17: OD .11″ x .88″ long

  • Autolite 4100
  • Motorcraft 2150
  • Autolite 2100

53-51 Intake Check Assembly

  • Carter W-0
  • Carter W-1
  • Carter YF, YFA

53-73 Intake Check Assembly 5/16″ – 24 thread

  • Carter AFB

S131-56: .31″ x 1/4″ thread

  • Stromberg 97
  • Stromberg 81

Updated on 04/27/2022

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