Jon told me a 290 nozzle is a 5 hole DT530 nozzle, and it's equivilant to a 100% nozzle today. He suggested swapping to something bigger at some point later on, like winter.
Maybe he just doesn't want to sell them to you! :evil He offered them to me a week or so ago, it's just not in the cards at this moment, a few weeks too soon.
Oh and for reference, a 290 nozzle is a DT530 5-holer, equivilant in flow to today's 100% nozzles. They didn't have big nozzles back in those days that were very safe to run, so people ran nozzles like these.
Dave
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