Starting a new thread just for fun to more specifically address playing with a set of Carl's BJ/BK dual quads. For those new to this build, I have a set of replica (or so I thought) BJ/BK carbs mounted on an Edelbrock RPM Air Gap Dual Quad Manifold with some custom offset spacers. Carbs are facing forward, BK is in the rear. Build is a moderate 445 stroker with quality internals, hydraulic roller, moderately worked Edelbrock heads, headers, sitting in a 1965 Thunderbird with C6 and gears midway between street and strip. I will try and keep this thread more to the form of the DMAIC process though I don't have a ton of measurement tools to work with in the way of performance measurements (no dyno for one).
Basically out of the box I am struggling with very rich idle, decent smooth cruise, rich pulse followed by lean on moderate to heavy acceleration. My intention is to work these carbs over as hard as needed over the winter and through next summer to maximize proper response at all throttle positions and rates of change.
Below please find some baseline carb setup data for BK.
My numbers should be within a thou. of actual, used high precision QB pins to mic holes.
Not super impressed with casting quality and machining, a bit of minor flash here and there on some of the ports and channels. If you happen to read this Drew, might still take you up on sending to you for review, just playing myself for now, I like to roll my own as much as I can.
Thanks and here are my numbers:
List number Set came from Carl's Ford
C3AF-9510-BK List 2804 and C3AF-9510-BJ List 2805
Type 2x4 4160's
Primary
Float non-metallic, side hung
Booster .142 Straight leg
Pump nozzle shipped 0.025, 0.032 now
Pump type and cam Don't recall as shipped, White #1 now
Idle air bleed .067
High speed bleed .034
Metering block# Nor sure on this, casting id is 34R 12683B
Main Jet 60
Power valve 6.5
PVCR .032
Emulsion 2 @ .027+ in each airwell
2 @ .027 in upper dogleg (1 in each) feeding emulsion tubes
Kill Bleed Not sure
Idle Feed restriction .027 in idle well
Needle and seat .097
Venturi size 1.20"
Throttle plate size 1.50"
Secondary
Metering plate marked as 34R 9716B #6 stamped in it
Mechanical or Vacuum? VS
Spring color Don't recall shipped, lightest now
Diaphragm length 1.95" (to rod pin hole center)
Float non-metallic, side hung
Booster .142 Straight leg
Pump Nozzle na
Pump type and cam na
Idle air bleed .027
High speed bleed .032
Metering block/plate# #6?
Idle Feed Restriction .030
Jet size or Main restriction .065
Needle and seat .097