The float chambers will fill slightly slower with 150. I still think you'll be fine with 150s. if the 175s are in good enough condition, hold onto them and swap them back in if it goes lean at the end of the Mulsanne straight. [emoji16]
is the thread the same size? otherwise looks like it should work OK.
Idle adjustment screws are very different [emoji848]
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Idle adjustment screws are very different [emoji848]