Rochester B, BC, BV 1 barrel carburetor main jet
Jet Stamping: Jet sizes are usually stamped on the top of the jet, or use a drill bit to determine your existing size.
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. See info here on adjusting jet size based on spark plug color.
Watch this video to help you determine your jet size by drill bit:
https://youtu.be/Jgy2Nlru7mQ?si=HnVchZN9wb-3_6-x
| 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 |