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Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

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Old 03-19-2007, 01:58 PM   #1
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Join Date: Jul 2001
Location: DALZELL illinois
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Car: 1991 firebird formula
Engine: 383
Transmission: th350
Axle/Gears: 3:73 posi

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holley mech 750 dp hesitates when hard throttle

I have a 383 stroker and me and my friend have been trying to tune it with timing and adjusting fronts and rears but we still have that bluuhh when you crack the throttle but once you get past the initial studder it pulls like crazy it also goes good when u ease into the throttle. So i guess im wondering if i need to rejet the carb cuz its stock from summit i have people saying its not getting enough but some think its getting too much. I need some pointers where to go from here. thanx Nick
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Old 03-19-2007, 02:33 PM   #2
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Car: 82 Berlinetta(2)/57 Bel Air
Engine: LS1 (LS1)/LQ4
Transmission: 4L60E (T56)/4L80E
Axle/Gears: 10B 3.73(9" 4.11)/8.2" 4.11

Classifieds Rating: (11)
That's accelerator pump tuning, not jetting.

If it happens when you suddenly open it to around half throttle, then it's at least primary accelerator pump. If it only happens when you floor it, it's probably the secondary accelerator pump - but could need both.

Last edited by five7kid; 03-19-2007 at 02:36 PM.
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Old 03-19-2007, 05:28 PM   #3
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Location: Orland Park, IL
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Car: 1984 Z28
Engine: SLOW carbed ls
Transmission: TH400 with brake, 8" PTC converter
Axle/Gears: moser 9" 4.11

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if you're local to me in IL bring it by and I'll tune it for you. Also, might need a lot more stall since that's not listed in your sig. Just checked your profile and a 2300 stall is NOT going to cut it, switch over to a 3400-3800 stall and it'll wake the motor up a lot more and not lug it at low rpms. I'm running a 3600 10" tci in mine that hit 4000 on the flash with my old rear end and tight gears, now that i'm running 4.11 gears I don't know what it'll stall at, but either way you're way understalled and could be the reason for the bog.
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Last edited by xpndbl3; 03-19-2007 at 09:15 PM.
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Old 03-19-2007, 05:28 PM
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