Page 408 - 2019-2020 Racecar Engineering Circle Track Parts and Accessories Catalog

Accelerator Pump Discharge Nozzles Standard Main Jets
Each pair of discharge nozzles includes 4 gaskets. Used on Holley main jets are threaded for ease of installation.
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type and tube-type nozzles were originally used on models FKDUW ([DPSOH +/< KDV DQ DSSUR[LPDWH KROH VL]H RI
4150, 4160 Straight-type and tube-type and 4500. Anti-pullover .040" diameter). Jets have 1/4"-32 UNF threads. Two per card.
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els, were engineered to combat “pump pull-over”, which occurs No. Size No. Hole Size No. Hole Size No. Hole Size No. Size
ZKHQ WKH ÀRZ RI DLU RYHU WKH QR]]OHV SXOOV IXHO IURP WKH QR]]OH 40 .040" 55 .054" 69 .0693" 83 .0975" 98 .124"
Anti-pullover sold individually. 42 .042" 56 .055" 70 .0735" 85 .0985" 99 .126"
43 .043" 57 .056" 71 .075" 86 .100" 100 .1285"
44 .044" 58 .057" 72 .0755" 87 .1015" 101 .126"
45 .045" 59 .058" 73 .079" 88 .1025" 102 .128"
46 .046" 60 .060" 74 .080" 89 .1045" 103 .130"
47 .047" 61 .060" 75 .082" 90 .1055" 104 .134"
48 .048" 62 .061" 76 .084" 91 .1085" 105 .137"
Straight Type Tube Type Anti-Pullover
Hole Size Part No. Part No. Part No. 49 .048" 63 .062" 77 .0855" 92 .110" 106 .141"
.018" HLY121-118 — — 50 .049" 64 .064" 78 .087" 93 .1125" 107 .145"
.021" HLY121-121 — — 51 .050" 65 .065" 79 .089" 94 .1155" 108 .147"
.025" HLY121-125 HLY121-25 HLY121-225 52 .052" 66 .066" 80 .089" 95 .1165" 109 .150"
.028" HLY121-128 HLY121-28 HLY121-228
.031" HLY121-131 HLY121-31 HLY121-231 53 .052" 67 .0663" 81 .092" 96 .1195" 110 .156"
.032" HLY121-132 — — 54 .053" 68 .0685" 82 .094" 97 .121"
.035" HLY121-135 HLY121-35 — Note: All sizes shown are for reference use only. Actual control of size is by
.037" HLY121-137 HLY121-37 HLY121-237 flow check. In all instances, a higher stamped number indicates a greater
.040" HLY121-140 HLY121-40 HLY121-240 average flow rate. Do not drill or damage the jet metering orifice. Change jets
.042" HLY121-142 HLY121-42 — to meet specific requirements.
.045" HLY121-145 HLY121-45 —
.047" HLY121-147 — —
.050" HLY121-150 — — Alcohol Jets
Standard-length alcohol jets are used with the 950 HP carbu-
50cc Accelerator Pump UHWRU PRGHOV +/< +/< DQG +/< DQG
Conversion Kit HLY20-11 ZLOO ZRUN ZLWK D VWRFN ÀRDW 7R RUGHU XVH SUH¿[ +/< IROORZHG
E\ WKH MHW QXPEHU IURP FKDUW ([DPSOH +/< KDV DQ DS-
Kit more than doubles the capacity of proximate hole size of .132" diameter). Jets have 5/16"-32 UNF
accelerator pump sys tem on Holley four- threads. Two per card.
bar rel car bu re tors.
Jet No. Hole Size Jet No. Hole Size Jet No. Hole Size
132 .132" 150 .150" 172 .172"
Accelerator Pump Cam 136 .136" 152 .152" 176 .176"
Assortment HLY20-12 138 .138" 154 .154" 180 .180"
140 .140" 156 .156" 184 .184"
Tailor pump performance to in di vid u-
al engine re quire ments by se lec ting the 142 .142" 158 .158" 188 .188"
prop er cam. 144 .144" 160 .160" 192 .192"
146 .146" 164 .164" 196 .196"
148 .148" 168 .168" 200 .200"
Accelerator Pump Arms HLY20-78
Part No. Description
Models 2300/4150/4160,
HLY20-78 Plastic
HLY20-114 30cc Pumps, Metal Alcohol Jet Kit HLY36-201
HLY20-114 Kit includes four each of 24 jet sizes
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Jet Assortment Kit carburetors. Packaged in a plastic carrying
HLY36-181 case.
The pro fes sion al way to track-tune
a carburetor for top performance. Kit Main Jet Removal Tool
contains two each of 36 dif fer ent jet sizes, HLY26-68
rang ing from 64 to 99, packaged in a plas-
tic case to keep them separated for easy Removes Holley jets without
access. damage.

404 2019-20 CIRCLE TRACK PARTS AND ACCESSORIES