[Tom Vaught]

The 3310-1 or -2 metering Blocks used to be available from Holley as part of a Rear Metering Block Kit. Kit Part Number was 34-13 and it came with the gaskets and the longer Bowl Screws needed with a Metering Block. A Metering Plate fits inside the Rear Bowl so they use the shorter bowl screws.

ALL of the Metering Plates used the same Prefix which is 134.

So a Metering Plate stamped 134-3 would have a "-3" would have a orifice with the same flow as a Number #56 Jet.

So for the complete list I will just type "-3 is #56 Jet" or "-4 is a #59 Jet"

"-3 is #56 Jet"
"-4 is #59 Jet"
"-5 is #63 Jet"
"-6 is #69 Jet"
"-7 is #53 Jet"
"-8 is #64 Jet"
"-9 is #64 Jet"
"-10 is #65 Jet"
"-11 is #72 Jet"
"-12 is #73 Jet"
"-13 is #63 Jet"
"-14 is #85 Jet"
"-15 is #82 Jet"
"-16 is #64 Jet"
"-17 is #69 Jet"
"-18 is #63 Jet"
"-19 is #69 Jet"
"-20 is #69 Jet"
"-21 is #75 Jet"
"-22 is #65 Jet"
"-23 is #64 Jet"
"-24 is #72 Jet"
"-25 is #77 Jet"
"-26 is #79 Jet"
"-27 is #79 Jet"
"-28 is #65 Jet"
"-29 is #75 Jet"
"-30 is #64 Jet"
"-31 is #74 Jet"
"-32 is #59 Jet"
"-33 is #64 Jet"
"-34 is #53 Jet"
"-35 is #69 Jet"
"-36 is #64 Jet"
"-37 is #69 Jet"
"-38 is #71 Jet"
"-39 is #69 Jet"
"-40 is #59 Jet"
"-41 is #69 Jet"
"-42 is #94 Jet"
"-43 is #71 Jet"
"-44 is #74 Jet"
"-45 is #79 Jet"
"-46 is #75 Jet"
"-47 is #78 Jet"
"-50 is #79 Jet"
"-53 is #65 Jet"
"-54 is #82 Jet"
"-55 is #78 Jet"

There is no "-48", "-49", "-51", "-52", or "-56" Metering Plate.

So when you find your #3310 Metering Block/Carb you will know what Jets to put into it on the rear side to have a carb with the same designed in jetting at the factory metering Plate carb. Except now you can jet up or down to dial it in further.

Typically the Holley Calibration is with-in two Jet #s of what the engine wants.

Have a great evening

Tom V.

ps Copy and Paste the info from this post onto a Word File or Excel File and put it in your Carb "toolbox"