Rochester B, BC, BV 1 barrel carburetor main jet. Jet sizes are usually stamped on the top of the jet, or use a drill bit to determine your existing size.
Original Rochester B, BC, BV Jet Sizes
Jet Testing
To determine if you have the correct jets in your carburetor, operate your vehicle for 20 minutes at sustained speeds. Stop and pull a plug. Gray - Good, Black - move down one jet size, White - move up one jet size. Do it all over again until you get a gray plug.
This assumes your engine and electrical system is in good running order.
Original Rochester B, BC, BV Jet Sizes
APPLICATION | TYPE | CARBURETOR NUMBER | SIZE |
Buick | |||
1964 6 SPL A/T | BC | 7024148 | .061 |
1964 6 SPL S/T | BC | 7024149 | .061 |
1965 225" A/T | BC | 7025148 | .061 |
1965 225" S/T | BC | 7025149 | .061 |
Checker | |||
230" | BV | 7024184 | .059 |
BV | 7025182 | .058 | |
BV | 7026083 | .057 | |
Chevrolet | |||
1932-40 Chevrolet 6 std | B | 7001374 | .052 |
1932-52 Chevrolet 6 service carb | B | 7004475 | .052 |
1932-52 6 S/T | BC | 7004620 | .052 |
1941-50 Chevrolet 6 A/T | B | 7002050 | .051 |
1950 Chevrolet 6 A/T | B | 7003060 | .058 |
1950-51 6 service carb | B | 7003986 | .056 |
1950-52 6 A/T | BC | 7003526 | .057 |
1951 (early) 6 ST | B | 7003152 | .051 |
1951 (late) 6 S/T | B | 7003865 | .051 |
1951 (early) 6 A/T | B | 7003160 | .058 |
1951 (LATE) 6 A/T | B | 7004495 | .056 |
1952 6 S/T | B | 7004477 | .052 |
1953 6 S/T | BC | 7004915 | .058 |
1953 6 A/T | BC | 7004478 | .058 |
1954 6 S/T | BC | 7005921 | .058 |
1954 6 A/T | BC | 7005922 | .058 |
1954 6 W/GOV | BC | 7005982 | .058 |
1955 6 A/T | BC | 7007180 | .058 |
1955 6 S/T | BC | 7007181 | .058 |
1955 6 W/GOV | BC | 7007172 | .058 |
1956 6 A/T | BC | 7009254 | .058 |
1956 6 S/T | BC | 7009255 | .058 |
1956 6 W/GOV | BC | 7009253 | .058 |
1957 6 A/T | BC | 7009656 | .057 |
1957 6 S/T | BC | 7009657 | .057 |
1957 6 W/GOV | BC | 7009784 | .057 |
1957 6 (Canada) | BC | 7011656 | .058 |
1957 6 (Canada) | BC | 7011657 | .058 |
1958 6 S/T | BC | 7012127 | .057 |
1958 6 A/T | BC | 7011102 | .054 |
1958 6 W/GOV | BC | 7012502 | .054 |
1959-60 6 A/T | BC | 7013000 | .054 |
1959-61 OPT 6 A/T | BC | 7013956 | .042 |
1959-61 6 S/T | BC | 7013003 | .057 |
1959-61 OPT 6 S/T | BC | 7013955 | .042 |
1959-61 6 W/GOV | BC | 7013005 | .057 |
1961 6 A/T | B | 7019000 | .056 |
1962 6 A/T | BC | 7020000 | .055 |
1962 6 S/T | BC | 7020003 | .056 |
1962 6 A/T OPT | BC | 7020106 | .042 |
1962 6 S/T OPT | BC | 7020107 | .042 |
1962 6 W/GOV | BC | 7020005 | .056 |
1963-64 6 230" A/T | BV | 7023000 | .059 |
1963-64 6 230" S/T | BV | 7023003 | .060 |
1963-64 6 230" OPT A/T | BV | 7023004 | .043 |
1963-64 6 230" OPT S/T | BV | 7023005 | .044 |
1965 6 230" A/T | BV | 7025000 | .058 |
1965 6 230" S/T | BV | 7025003 | .059 |
1965 6 230" OPT A/T | BV | 7025004 | .041 |
1965 6 230" OPT S/T | BV | 7025005 | .042 |
1966 6 250" S/T | BV | 7026027 | .060 |
1966 6 250" A/T | BV | 7026028 | .058 |
Chevrolet Truck | |||
1932-40 216" | B | 7001374 | .052 |
1932-52 216" | B | 7004475, 7004620 | .052 |
1941-50 216" | B | 7002050 | .051 |
1950-51 (early) 235" | B | 7002051 | .058 |
1951 216" | B | 7003152, 7003863 | .051 |
1951 (late) 235" | B | 7003864 | .058 |
1952 235" | B | 7004476 | .059 |
1953-58 235" | B | 7004468 | .058 |
1954-59 261" | B | 7005140 | .065 |
1959 STD 235" | B | 7002956 | .056 |
1959 OPT 235" | B | 7013953 | .043 |
1960-62 STD 235" | B | 7015011 | .055 |
1960-62 OPT 235" | B | 7015021 | .043 |
1960-62 STD 261" | B | 7015013 | .064 |
1963 292" | B | 7023013 | .073 |
1963-64 STD 230" | B | 7023011 | .057 |
1963-64 OPT 230" | B | 7023021 | .042 |
1963-64 C.O.E. 230" | B | 7023017 | .057 |
1964 292" | B | 7024009 | .072 |
1965 230" 1/2, 3/4. 1 1/2 TON | B | 7023017 | .057 |
1965 230" 3/4 TON FWD | B | 7023011 | .057 |
1965 230" 1/2 TON CUSTOM | B | 7023021 | .042 |
1965 292" | B | 7024009 | .072 |
1966 194" | B | 7026019 | .063 |
1966 230" | B | 7026017 | .057 |
1966 230" OPT 6 | B | 7023021 | .042 |
1966 250" | B | 7026011 | .058 |
1966 250" W/GOV | B | 7026029 | .063 |
1966 292" | B | 7024009 | .072 |
1966 292" A.I.R | B | 7036009 | .071 |
Chevelle | |||
1964 194" S/T | BV | 7023105 | .060 |
1964 194" A/T | BV | 7023108 | .059 |
1964 (early) 230" A/T | BV | 7024000 | .070 |
1964 (late) 230" A/T | BV | 7023000 | .059 |
1964 (early) 230" S/T | BV | 7024001 | .072 |
1964 (late) 230" S/T | BV | 7023003 | .060 |
1965 194" S/T | BV | 7025105 | .060 |
1965 194" A/T | BV | 7025108 | .059 |
1965 230" S/T | BV | 7025003 | .059 |
1965 230" A/T | BV | 7025000 | .058 |
1966 230" A/T | BV | 7025000 | .058 |
1966 230" S/T | BV | 7025003 | .059 |
Chevy II | |||
1962 (early) 4 A/T | B | 7020104 | .053 |
1962 (early) 4 S/T | B | 7020103 | .055 |
1962 (late) 4 A/T | B | 7020114 | .054 |
1962 (late) 4 S/T | B | 7020115 | .056 |
1962 6 A/T | BC | 7020108 | .055 |
1962 6 S/T | BC | 7020105 | .059 |
1963-64 6 S/T | BV | 7023105 | .060 |
1963-64 6 A/T | BV | 7023108 | .059 |
1965 195" S/T | BV | 7025105 | .060 |
1965 195" A/T | BV | 7025108 | .059 |
1965 230" A/T | BV | 7025000 | .058 |
1965 230" S/T | BV | 7025003 | .059 |
1966 194" A/T | BV | 7025108 | .059 |
1966 194" S/T | BV | 7025105 | .060 |
GMC | |||
P1500-P2500 | B | 7023011 | .057 |
230" | B | 7026017 | .057 |
250" | B | 7026011 | .058 |
250" W/GOV | B | 7026029 | .063 |
292" | B | 7024009 | .072 |
Jeep Kaiser | |||
V6 225" | BC | 7025149 | .061 |
Kiekhaefer Marine | |||
194" MASTER | BC | 7020994 | .061 |
194" AUX | B | 7020996 | .060 |
230" MASTER | B | 7024180 | .061 |
230" MASTER | BC | 7024183 | .061 |
230" AUX | BC | 7025184, 7024181 | .060 |
Oldsmobile | |||
1964 F85 225" A/T | BC | 7024148 | .061 |
1964 F85 225" S/T | BC | 7024149 | .061 |
1965 F85 225 A/T | BC | 7025148 | .061 |
1965 F85 225 S/T | BC | 7025149 | .061 |
1966 F85 250" S/T | BV | 7026027 | .060 |
1966 F85 250" A/T | BV | 7026028 | .058 |
Outboard Marine | |||
153" L-4 | BC | 7024089 | .058 |
225" V-6 | BC | 7024087 | .061 |
Pontiac | |||
1951-52 6 | BC | 7002870 | .058 |
1961 Tempest L-4 S/T | B | 7019061 | .058 |
1961 Tempest L-4 A/T | BC | 7019062 | .058 |
1962 Tempest L-4 S/T | B | 7020061 | .058 |
1962 Tempest L-4 A/T | BC | 7020062 | .057 |
1963 Tempest 4 195" S/T | B | 7023067 | .058 |
1963 Tempest 4 195" A/T | BC | 7023068 | .057 |
1964 6 Tempest 215" S/T | BV | 7024164 | .060 |
1964 6 Tempest 215" A/T | BV | 7024166 | .059 |
Jet Testing
To determine if you have the correct jets in your carburetor, operate your vehicle for 20 minutes at sustained speeds. Stop and pull a plug. Gray - Good, Black - move down one jet size, White - move up one jet size. Do it all over again until you get a gray plug.
This assumes your engine and electrical system is in good running order.