Requires 2.5 - 3 lbs of fuel pressure, see regulator kit part# 1035056We at LC Engineering were never happy
with the fitment of Weber's 2-piece adapter for carburetors, so after
years of continuous testing on racing and off-road applications, LCE
came up with a better design that actually improves horsepower because
of its spiral design. Engineered and made in the U.S.A.