Engine Maintenance and Modification Bradley Artigue

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FIAT 124 Spider Engine Maintenance + Modification passage in the manifold is blocked. Conversely, the 1438 manifold cannot be used on the other heads unless the passage in the head is blocked. • The center-to-center combustion chamber spacing is the same on all heads. The combustion chamber sizes vary with the USA 2000cc amongst the largest, affording the lowest compression ratio. • The 1438 and 1608 heads can be distinguished from other twin cam by the size of the water passage on the head face in front of cylinder #1. The width of this passage on these heads is 14mm (0.55"). The 1592cc, 1756cc & 2000cc heads have a 9mm (0.35") wide passage. Because of this, the 1438cc & 1608cc heads will not work on the 84 mm bore engines unless this water passage is welded. • The exhaust port size is nearly identical on all DOHC heads. The intake port size varies. Generally, the smallest port size is found on the 1438cc. The 1608cc, 1756cc & Volumex heads share approx the same, large intake port size. 62
FIAT 124 Spider Engine Maintenance + Modification 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 63
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Engine Maintenance and Modification Bradley Artigue

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