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Old 10-21-2012, 07:40 PM
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Holley sec metering plates can be modified to accept holley main jets.
the 134-9 plate is way too lean. Drill Hole A to .081" at least.
or get a #21 and #27 plate. ( #21 plates are found in 3310 holleys)
Or drill and tap for holley screw in main jets and block Holes A

start rich.... work towards lean

Start at 80 pri and 78 sec with power valve plugs installed.

An educated guess suggests you will end up with best power jetting
right around 74 to 76 jets square ( with no power valve)
That means the Hole A in the metering plate will want to be +/- .080"

Start tuning rich big jets and work leaner noting power and spark plug appearance.

Do not go to the dyno test with just 4 jets. and no power valve plugs or carb bowl/metering block gaskets.
Bring extra spark plugs.

Last edited by F-BIRD'88; 10-21-2012 at 07:58 PM.
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