
Nut UNC 1/4-20 h=5.5 mm for Volvo Amazon, 1800
PV 444, PV 544, Duett, Amazon, 1800, 164
- Model year:
- 1957–1974
- Thread:
- 1/4"-20 UNC
- Engine:
- B16, B18, B20
- System:
- Stromberg
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Cracked rubber gaskets and tired clamps between the filter housing and carburetor can let in unfiltered air and cause rough idle – a common check point on the B20B with SU carburettors. This category gathers the parts around the air cleaner rather than a single item.

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The group includes filter housings, gaskets, hose clamps, clamps and brackets along with nuts, studs and complete mounting kits. Since the B20B runs with twin carburettors, it is worth checking the mounting and sealing surfaces against your setup before ordering – the design of the filter housing and fasteners differs from the single-carburetor engines. The right gasket and a tightened clamp keep the intake side sealed and protect the engine from dust.