Checkballs and Checkweights

90-21: 1/8" Steel

• Holley 1940 (you can use an extra checkball in place of the weight if your weight is missing)
• 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

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

90-20: 5/32" Aluminum

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

90-146: 9/64" Steel

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

90-39: 5/32" Nylon

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

90-19: 3/8" Aluminum

• Rochester B pump discharge ball

90-158: 3/16" Steel

• Autolite 4100, 2100, 2150: discharge, under the primary venturi screw
• Rochester 4G
• Rochester 2G: main discharge
• Stromberg AAV

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

• 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

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

17-38: OD .205" x .560 long

• Autolite 1100

17-66: 0.156" OD x .517" long

• Holley pump discharge weight

32-49: OD .097" x .891" long

17-143: 3/8" long

• Carter Thermoquad, TQ
• Carter WCFB

17-17: OD .11" x .88" long

• Autolite 4100
• Motorcraft 2150
• Autolite 2100