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  1. R

    Q-jet tuning. Where's the starting line? 5.7L

    I'm looking for empirical data / advise on Q-jet tuning for a 5.7L vortec alpha on a 19' searay. Would anyone like to share their Q-jet data on jets, metering rods, air bleed size, mixture / rmp performance? I recently cupped two intake valves on a "FRUNKENSTEEN" 5.7l (see my post on cupping...
  2. R

    Valve cupping? why? Anyone?

    Stats: mercruiser 5.7l 4brl. Holy carb alpha sn: ol378057 about 2001 & 100 hours It ran so perfect for 100 hours then started to run rough one day. so back to dock and home. Compression test: #6 dead, #3 weak. Heads off: #6 plug electrode melted, intake valve cupped in towards head by about...
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