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Old 04-27-2006, 11:25 AM
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Holley Too Rich?

350 Sbc 4150hp 750 Holley - On Hard Acceleration, Car Boggs And Stalls! Pulled A Plug And It Looks Rich. How Many Jet Sizes Should I Go Down From Stock On Primary And Secondary To Start? Thanks

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Old 04-27-2006, 11:40 AM
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sounds like the pump-shot (accelerator pump) to me, versus jets. jetting would affect overall driveability more than it would change instantaneous throttle movement. start with the accelerator pump....
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Old 04-27-2006, 12:58 PM
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Yes, the pump can make it bog. Sounds like you need more accelerator pump and smaller jets. If the plugs look black then lean it out 2 or 3 jets sizes. I run 69's in the primary's on my 350 with a 292H cam and a 750 Holley.

Also, you might be running rich because the throttle blades are opened into the main circuit (past the idle circuit). A lot of times big cammed engine require the throttle blades to be open further than normal at idle which puts the throttle blades past the transition slot. This makes the plugs black black black no matter which size jets you use.

do a web search on how to tune a Holley and this information about transition slots and the cure will be in there.

I had a similar problem with a 454 and a Holley 750. Had to drill two small holes in the front throttle blades and richen up the idle screws to stop the bog.
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Old 04-27-2006, 01:04 PM
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a 750 is too big for a 350 unless your bracket racing. it's hard to tune away too much cfm. the air is moving so slow that the fuel is not atomized when it gets to the cylinder so you don't get a good burn.
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Old 04-27-2006, 01:16 PM
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Quote:
Originally Posted by shine
a 750 is too big for a 350 unless your bracket racing. it's hard to tune away too much cfm. the air is moving so slow that the fuel is not atomized when it gets to the cylinder so you don't get a good burn.

In spite of your having a 4150 hp SBC........ oh,,,,, that is a 4150 Hi Po carb..... LOL..... I agree with Shine.... Big carbs are only good for wide open dyno pulls to read that max hp. Driveability sucks unless you have annular discharge nozzles and a knowledgable tune job.

I'd borrow a 600 vac secondary and see how much better it runs.!!!!!!!!
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Old 04-27-2006, 01:27 PM
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I guess I missed the carb style (4150). Yes, maybe a double pumper 750 is too big for a 350. I guess that would also depend on cam, compression, gears and stall.

I run a 750 holley with vacuum secondarys with a 350 and it doesn't even come close to bogging. Vacuum secandarys are much more tuneable for the street.
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