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THIS BLOCK OFF PLATE CLOSES OFF 2 OF THE 4 BUTTERFLIES TO HELP A 3"
BUTTERFLY 4 PORT HILBORN USE EITHER EFI OR ALLOW A 4 PORT TO WORK ON A SMALL ENGINE
BILLET ALUMINUM - PRECISION MILLED - JUST REMOVE SCOOP AND PUT IT BETWEEN SCOOP AND
INJECTOR BODY.
HILBORN 4 PORT