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Old 07-09-2010, 08:10 PM
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4777 Baseline

The 4777 comes jetted 67/73 w/a 65 power valve. Primary and secondary pump nozzle is a 0.028.

Check the operation and adjustment of the secondary accelerator pump. Like ericnova72 has said- the hole is likely an inadequate secondary pump shot.

Going by your vacuum reading, it does not need anything less than a 55 power valve.
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