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Old 10-10-2011, 05:44 PM
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What jets for Carb.?

What size jets do I need to put in a 670 Street Avenger vacumn secondary carb. on a SBF 302 with stock heads (ported and polished), a hydraulic roller camshaft (with 551 intake lift and 546 exhaust lift with duration of 222 on intake and 226 on exhaust), stock pistons, stock stroke, and dual plane intake?

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Old 10-22-2011, 06:21 PM
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Chances are the original equipment jetting is going to be very close for your combo.

If you suspect the carb has been messed with, get the list number off it and check it out on Holley's website - all the metering info for how your carb came out of the box is available there. Get it close to their calibration and chances are you won't be back into it again other than some fine tuning.

You may spend more time trying different springs on the secondary diaphragm than changing jets - probably more worth your while.
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Old 10-23-2011, 05:14 AM
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X2^^^.
Many of the SA's had an off idle stumble but, normally larger accellerator Shooters or Cam fixed that. The Jets are usually very close to ideal.
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Old 10-23-2011, 06:36 AM
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Stock jetting was 65P 68S I believe. The idle and transition circuits are lean on these carbs. I had the stumble issue and had to up the shooter size quite a bit to cover up the lean tip in. I ended up with 68P and 72S. It ran ok on a 4V 351C.
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