Accelerator Pump Discharge Nozzles (DFKSDLURIGLVFKDUJHQR]]OHVLQFOXGHVJDVNHWV8VHGRQ DQGVHULHVFDUEXUHWRUV6WUDLJKW type and tube-type nozzles were originally used on models 6WUDLJKWW\SHDQGWXEHW\SHDQG$QWLSXOORYHU VW\OHQR]]OHVRULJLQDOO\XVHGRQSURGXFWLRQDQGPRG - els, were engineered to combat “pump pull-over”, which occurs ZKHQWKHÀRZRIDLURYHUWKHQR]]OHVSXOOVIXHOIURPWKHQR]]OH Anti-pullover sold individually.
Standard Main Jets Holley main jets are threaded for ease of instal- ODWLRQ7RRUGHUXVHSUH¿[+/<IROORZHGE\
WKHMHWQXPEHUIURPFKDUW([DPSOH +/< KDVDQ DSSUR[LPDWHKROHVL]HRIGLDPHWHU -HWVKDYH 81)WKUHDGV7ZRSHUFDUG Hole Size HLY40 .040" HLY60 .060" HLY77 .0855" HLY95 .1165" HLY44 .044" HLY61 .060" HLY78 .087" HLY96 .1195" HLY45 .045" HLY62 .061" HLY79 .089" HLY97 .121" HLY46 .046" HLY63 .062" HLY80 .089" HLY98 .124" HLY47 .047" HLY64 .064" HLY81 .092" HLY99 .126" Jet No. Hole Size Jet No. Hole Size Jet No. Hole Size Jet No. HLY48 .048" HLY65 .065" HLY82 .094" HLY100 .1285" HLY49 .048" HLY66 .066" HLY83 .0975" HLY101 .126" HLY50 .049" HLY67 .0663" HLY85 .0985" HLY102 .128" HLY51 .050" HLY68 .0685" HLY86 .100" HLY103 .130" HLY52 .052" HLY69 .0693" HLY87 .1015" HLY104 .134" HLY53 .052" HLY70 .0735" HLY88 .1025" HLY105 .137" HLY54 .053" HLY71 .075" HLY89 .1045" HLY106 .141" HLY55 .054" HLY72 .0755" HLY90 .1055" HLY107 .145" HLY56 .055" HLY73 .079" HLY91 .1085" HLY108 .147" HLY57 .056" HLY74 .080" HLY92 .110" HLY109 .150" HLY58 .057" HLY75 .082" HLY93 .1125" HLY110 .156" HLY59 .058" HLY76 .084" HLY94 .1155" Note: All sizes shown are for reference use only. Actual control of size is by flow check. In all instances, a higher stamped number indicates a greater average flow rate. Do not drill or damage the jet metering orifice. Change jets to meet specific requirements. Alcohol Jets 6WDQGDUGOHQJWKDOFRKROMHWVDUHXVHGZLWKWKH +3FDUEXUHWRUPRGHOV+/<+/<DQG +/< DQGZLOOZRUNZLWKDVWRFNÀRDW7RRUGHU XVHSUH¿[+/<IROORZHGE\WKHMHWQXPEHUIURP FKDUW([DPSOH +/< KDVDQDSSUR[LPDWHKROH VL]HRIGLDPHWHU -HWVKDYH81)WKUHDGV Two per card. Jet No. Hole Size Jet No. Hole Size Jet No. Hole Size Jet No. Hole Size HLY132 .132" HLY146 .146" HLY158 .158" HLY192 .192" HLY136 .136" HLY148 .148" HLY160 .160" HLY196 .196" HLY138 .138" HLY150 .150" HLY164 .164" HLY200 .200" HLY140 .140" HLY152 .152" HLY168 .168" HLY180 .180" HLY142 .142" HLY154 .154" HLY172 .172" HLY184 .184" HLY144 .144" HLY156 .156" HLY176 .176" HLY188 .188"
Straight Type Part No. HLY121-118 HLY121-121 HLY121-125 HLY121-128 HLY121-131 HLY121-132 HLY121-135 HLY121-137 HLY121-140 HLY121-142 HLY121-145 HLY121-147 HLY121-150
Tube Type Part No.
Anti-Pullover Part No.
Hole Size
.018" .021" .025" .028" .031" .032" .035" .037" .040" .042" .045" .047" .050"
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HLY121-25 HLY121-28 HLY121-31 HLY121-35 HLY121-37 HLY121-40 HLY121-42 — HLY121-45
HLY121-225 HLY121-228 HLY121-231
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HLY121-237 HLY121-240
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Accelerator Discharge Screws Part No. Description HLY121-6 Solid Discharge Nozzle Screw, for Nozzles up to .037" NEW! HLY121-7 Hollow Discharge Nozzle Screw, for Nozzles .040" and Larger
50cc Accelerator Pump Conversion Kit HLY20-11 Kit more than doubles the capacity of accelerator pump system on Holley four- barrel carburetors. Accelerator Pump Cam Assortment HLY20-12 Tailor pump performance to individu- al engine requirements by selecting the proper cam. Accelerator Pump Arms Part No. Description HLY20-78 Models 2300/4150/4160, Plastic HLY20-114 30cc Pumps, Metal
Alcohol Jet Kit HLY36-201 .LWLQFOXGHVIRXUHDFKRIMHWVL]HV IURPWR-HWV¿WRQO\+ROOH\ +3VHULHVDQG &)0DO - FRKROFDUEXUHWRUV3DFNDJHGLQDSODVWLF carrying case. Main Jet Removal Tool HLY26-68 Removes Holley jets without damage.
HLY20-78
HLY20-114
Jet Assortment Kit HLY36-181
The professional way to track-tune a carburetor for top performance. Kit contains two each of 36 different jet sizes, UDQJLQJIURPWR SDFNDJHGLQDSODV tic case to keep them separated for easy access.
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CIRCLE TRACK 2021-22
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