What I like about the 12mm pump head is that you can actually do better tuning. You can accomplish more power with minimal smoke as you adjust the LDA with an aftermarket fuel pin (I like the design from The Hungry Diesel) nice ramp.
I do know you can get the 11mm head from a Volvo penta marine engine but it’s really difficult to find as it would need to be from a twin engine application where it’s the counter rotating port engine.
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