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Trust me on this...
I tried it on an I-4, it didn't work, and used more fuel.
On later engines, the Fuel-Injection system (and oxygen sensor feedback loop) requires a pre-determined ratio. If you override this, it might benefit, but...
You'll have hot and cold spots and pumping losses. An engine swap is easier...
RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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