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i'ld say 40's on a 1.8 if there enuff for a std xe there enuff for a 1.8!! although xe's go better with 45's:p
 

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For best fuelling you really only want 40's on upto 1.6.
For bigger engines, use 45's with the smaller size chokes but there is nothing to stop you using 40's with the biggest chokes.
The only problem comes if you are making any other major engine mods, then the 40's will be running at their limit, but if you are using the 45's they can cope easily.
 

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Typically 45s are harder to find and more expensive. Given the choice on a standard 1.8 I'd go for 40s.
 
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