Alirght I got a 350 rocket with a basically stock intake and a quadrajet bored out <supposedly> .008 over <that is 8 tenth thousandths>. Anywya its in a 85 Cutlass with a TH350 and a posi 3.73 rear end. The problem is that its conatantly stalling out me especaially when I'm romping down onthe pedal then lifting off. An example, say I'm workingn on a burn out and I romp down on her and she spins wheels then stalls out me, and this is when she is warm.

I'm in need of some carburator help so to say! TIA

j.wolfe

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91 Trans Am GTA
WS6*K&N*MSD

 

I didn't know you could get a 85 Cutlass with a 350... they came with either an Olds 307 (insert gagging sounds here) or a Chevy 305... what's been "bored out .008"? Or do you actually have an Olds 350 in place of the 307, perhaps with the 307 top end still on it?

Anyway, yes your carb is responsible; you might want to just turn the idle speed up a smidge. Vacuum leaks will also cause that; so check all your vacuum hoses, etc.

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"So many Mustangs, so little time..."

 

Yes the car did come with a 307 originally but as of now there has been a 71 350 Rocket rebuilt that supposedly has an 11:1 compression ratio. The intake is a 350 Rocket intake with a Quadrajet that has been supposedly bored out .008 in the barrells. This isnt my car this is my buddies car and since neither of us ar quite as educated in carb work I figured I would ask to see what you all think.

TIA

j.wolfe

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91 Trans Am GTA
WS6*K&N*MSD

 

i will first point out that 350 rocket as you call it is just the name for all olds v8's until 1978 when a lawsuit stopped it. 11.0 to one was not a factory compression for a 1971 350 olds. your problem is likely float sticking or fuel pump problem. but your not leaving much info. need to know when it stalls what is missing and where.

 

They don't bore the barrels out. Not even the NASCAR guys do that. What somebody probably did was put .008" bigger jets in it. Those are little brass screw-in things that go in the very bottom of the carb, that determine how much fuel the carb feeds at any given air flow. In a Q-Jet, .008" on the jets is radical. Typical jet sizes in non-ECM Q-Jets are between about 60 or so in early non-emissions carbs with small air bleeds, to 72 or 74 in later ones with large air bleeds which force the car to run leaner even with the bigger jets by letting more air into the main system to reduce the signal. .008" is more than a 10% difference in diameter, which is around a 20% difference in mixture, which is more than what the difference between low-load cruise and full power is supposed to be. Basically it's off the scale as far as a calibration adjustment. When calibrating a carb, 2 jet sizes is a step, 3 sizes is a big step, 4 jet sizes is a REAL BIG LEAP.

Anyway, to the problem: either a lean or a rich condition can cause the behavior you report. Check to see next time it does it if there's black smoke coming out the tailpipe. Have somebody behind you to watch.

zippy is right, "Rocket" was Olds's universal trade name for their engines from the 50s until they were forced to drop it. You may even recall that their logo for all those years was a rocket enclosed in a sort of square. That slogan doesn't indicate anything special about anything. Also, 11:1 is too much compression for the street, because it will force you to have to back your timing off real far to keep it from detonating. That in turn will make the car sluggish and have low idle vacuum. If in fact the CR is that high, it may be contributing to your problem.

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"So many Mustangs, so little time..."

[This message has been edited by RB83L69 (edited July 31, 2000).]

 

Thanks guys, I will definately let my buddy know!

As for the black smoke, well I know its not blowing any of that, because I've been behind the car in my car when he's romped down on it and it stalls. I guess I'll have to read up and get some more info on the intake and carb and block for that matter, to correctly assess the situation. Thanks again for the info!

j.wolfe

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91 Trans Am GTA
WS6*K&N*MSD