Inliners International Forums General Discussion Hi Performance Jet size for Holley 390 on chevy 250

X2 with Frenchtown

There is one way to see if the metering block has any issue is to turn the air fuel mixture screws all the way in IF!! the motor does stall From either side There is a blockage.When turned all the way in the motor should die.IF it does not then there is a issue with the metering block as well.