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Old 05-21-2005, 05:42 PM
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holley 4150 help

ok i have a holley 4150 750 cfm.
I recently changed manifolds and now I get a big stumble from a standing start.
I think I need bigger shooters?
I have the white pump cams installed .
BTW no black smoke is apparent during the launch.
only knowledgeable persons need apply I wont accept a well maybe its this lol.
but i think the shooters are the answer

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Old 05-21-2005, 07:28 PM
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The following was a reply posted by the "Bracketeer" in response to a similar question that may help you. I thought this was a well thought out and complete post. Enjoy.

First set the secondary butterfly valves. There is a hidden screw under the carb. Back it out until it just touches the linkage. Screw it in 1/4 turn. Install carb on car. Adjust air/fuel needle valves to 1 and 1/2 turns out. Adjust choke plate so it just starts to open at room temperature. Start car and set fast idle to about 1800 rpm. Screw is located on passenger side. When motor is warmed up kick off choke. Set curb idle to 800 rpm (on drivers side). Adjust floats until gas starts to dribble out sight plug and back off 1/6th of a turn. Attach vacuum gage and screw fuel /air needle valves (one at a time) in until motor stumbles. Back out until highest vacuum reading is achieved. This can also be done with a tach for highest rpm. Screw in until vacuum starts to drop. Back out again and stop as it just hits highest vacuum. Install power valve 1/2 highest vacuum. Carb comes stock with a 6.5 for 13 inches of vacuum. If car stumbles on acceleration increase shooter size. If car bogs reduce shooter size. Rule of thumb is 3 sizes for 1 second of hesitation. 1 or 2 sizes for a half second. Run car and check plugs for color. White is lean, black is rich. Plugs should be the color of dirt. Even dark brown is not bad. If car stumbles after rejetting, shooters may have to be resized again.
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