Where did the term "China Rails" come from

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P5249619.jpg
INTAKE MANIFOLD END SPACERS
These Manifold End Spacers were designed to fill the gap between the intake manifold and the block when installing W5/W7/W9 heads on stock height blocks. Use in conjunction with RTV and standard end seal gaskets. Gasket not included.
P5249619​
Intake Manifold End Spacers — Set of 2 (Small Block W5/W7/W9 Heads)​
$ 49.95​

We use to call them the china wall extensions at the speed shop in the 80's. That is all I remember where it was ever mentioned.
 
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