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