Holley Standard Main Jet #109 HO122-109 Heat Exchangers 8740 chrome moly is seen

8740 chrome moly is seen as a good tough steel

The exhaust valve isnormally closed for all applications

Part Number: AF9201-250M

Part Number: AF64-5234BLK

Holley Standard Main Jet #109 HO122-109 Heat Exchangers 8740 chrome moly is seenStandard Main Jet #1091 4 32" Thread, . 150" Hole Size (Pair) Brand: HOLLEY Part Number: HO122 109 Description: These metering orifices control fuel flow into the metering system. They are rated in flow capacity "cubic centimetres per minute" and are changeable for tuning purposes. The shape of the entry, exit, and size determines flow. All Holley Main Jets are flow tested and then stamped with the correct number.