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Rochester B, BC, BV Specifications

Rochester B Screw Sizes
A- 10-32 x 1″ 80D86 B-6-32 x 5/16″ 80D31 C- 3/16″-32 x 1″ tap the idle hole to 10×32 and you can use the same screw as the float bowl.

Your carburetor must look like the one above. The older B’s used a different size screw not produced these days.

Rochester 1 Barrel Screws
A-6-32 x 5/16″ 80D31 B-5/26″ -24 x 1 1/4″
Rochester BC Screw Sizes
A- 8-32 x 3.8 80D42 Retainers-80D279B
MAKEYEARCARB NUMFLOAT LEVELFLOAT DROPPUMP RODUNLOADER
PONTIAC196370230671 9/321 3/4S-OUTER, A-INNER.160
PONTIAC196370230681 9/321 3/4S-OUTER, A-INNER.160
PONTIAC196470241641 9/321 3/4.230
PONTIAC196470241661 9/321 3/4.230
CHECKER70241841 9/321 3/4.350
STUDEBAKER196570250871 9/321 3/4
.350
STUDEBAKER196570251051 9/321 3/4.350
STUDEBAKER196570251081 9/321 3/4.350
Rochester B, 1 barrel carburetor specifications
Updated on 06/04/2021

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