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on e85, my 10:1 ran great with a 5858 and a 6262. ran out of fuel at 525whp on the 5858 with 1000cc's. with the 6262 we upgraded to a walbro 485 and a return fuel system and maxed the 1000's at 590whp. for what you want, id stick around 10:1. a lot more room for error and headroom than 12.5:1 in my opinion. the spool on the 5858 was great for the power it can produce at 10:1
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