Fiat 124 Spider - Intake Manifolds

FIAT 124 Spider
Engine Maintenance + Modification
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7. Intake Manifolds
FIAT used two types of intake manifolds on carbureted engines. The type of manifold
was relative to the type of carburetor. Carburetors fitted with a vacuum operated
secondary barrel (those with an “H” in the name) were fitted with a manifold with
different sets of upper and lower runners. These can be identified by removing the
carburetor and noting that the two barrels have their own plenums, instead of one large
opening underneath the carburetor base. When using the vacuum type carburetors it is
important to have the dual planes for proper opening of the secondary barrel; when using
the non-vacuum carburetors the split planes will impede performance. Therefore it is
important to have the correct manifold for your carburetor and, if you are planning a
swap to another carburetor, that you are also planning for a manifold swap.
Table 7: Intake Manifold Casting Numbers
Part Number Original Fitment
4186411 1438cc 1967-1968
4226586 1438cc 1968-1970
4242994 1608cc 1971-1973 (Dual IDF)
4248067 / 4248068 1608cc 1971-1973
4304461 1592cc 1973
4308888 1756cc 1974
4334447 1756cc 1975-1978
4406112 2000cc 1979-1980 (Carbureted)
4468499 2000cc Fuel Injected