My 1981 Corvette has a 383 Stroker in it with a 3 speed th350. Not entirely sure what entirely composes the motor (cam, headers, etc..) but i'm figuring it out as I go. Hopefully will know everything about it there is to know as I get more time to work on it in these upcoming months. I do know she has a MSD Blaster 2, and a Digital 6AL set at 7000 rpm limit, a Holley 670 cfm Street Avenger (It is jetted properly), True Duals. She'll get up and get when I give it the ol' gas drainer pedal to the metal(Because yanno I like to see the looks on 5.0 mustangs and Hellcats faces when I leave them sitting). However she does have a few setbacks. That I need all the wise wisdom of these forums I can get to help. So if I try to pedal to the floor from a dead stop she dies, I think she floods out from that could use advice on how to fix that if I can. Now if I send er from around a 20-30ish she'll sometimes have a lag to the zoom zoom but anything after around 40 its fine. Lastly, She does like going above 100mph I can't give it any gas its like its capping itself, max i think is 117 (Governor?, did they make them for 81's?). No I don't drive like that all the time just like to have my fun every now and then because don't we all? I just want to know what causing some of these things. Any help from you wise gents is appreciated. Keep in mind I'm not very engine savy so if because this is the first car like this I've actually got into working on it, So i will definitely be asking questions about any fancy car words. Will reply with more info if i figure any more out as i work on it tonight or tomorrow.

 

Take the air cleaner off and look down the carb, then push the throttle linkage all the way in quickly like you're mashing the gas pedal. Check to see if your squirters are squirting, that should start to clue you in if it is bogging down because it's going rich or going lean.

 

Rookie-me cannot help with the carb problems, but there are Forum members who can give you some good advice.
And...always post pics of the problem-area you are dealing with...
You would be surprised at what the Forum members can spot (fuel line needs rerouting/vac. line on wrong port/etc.)

 

Will post pictures tomorrow as well as try the throttle trick to see if if too lean or rich

 

The only governor on these things is the valve springs. Actually you put a governor on it with that MSD box. But You really don’t want to be in the 7000 RPM range with these guys.

 

If its instantaneously bad, then I would lean towards a fuel problem, but it could be just not burning....Check your timing and see if its all in by 3000 and its 36 to 38 degrees. If you can get your hands on an AFR gauge and it will tell you if its lean or rich. Other than that you will have to start reading plugs

 

You say it is jetted properly......but I almost 100% doubt that.
Check your timing first......if it is not 36 degrees at or around 3000 RPM...then the carb is not jetted correctly......and from my experience with the Street Avenger, they need a lot of jet to make them work on anything.
You cannot properly jet and set idle mixture on an engine that has incorrect timing specs.

Jebby

 

Tried the throttle, they are squirting in the fuel and starts to die if I don’t let off

 

SO if you keep the throttle in and running at a high rpm, then it will suck the bowl dry and it dies, but if you let off the throttle down to idle it will keep running? If this is true you need to get a fuel pressure gauge and see what your pressure is and maybe do a fuel flow test to see howw much fuel you are getting

 

I have a pressure gauge connected to the line going to the carb. It normally runs about 10-12 will have to have someone watch it for me when I do the throttle to see and yes if I let off it’ll normally start running normally again but sometimes it will die

 

You need to dial it back to about 6.5 psi. The problem maybe you are drowning your engine. Once the needle comes out of the seat when you drain the bowl, it may not reseat and you are flooding the engine.....a possibility but no proof. But if you are not at a high RPM that can use all the extra fuel like the issue you are having at lower rpm, then it sounds like a possibility. Do you have an in line regulator?
Sounds like you may have a few different issues goiing on

 

The extra pressure I believe comes from this temporary rubber fuel line I have going from my gauge to the carburetor as the last time I messed with my jets my stainless line decided to dethread itself I have a new line I just gotta make when it arrived it was too long and I have to cut it to fit. But it was doing this before when the pressure read normally and I had my stainless line on there

 

Working on getting a timing light to check timing, will be rechecking and checking the jets, fuel bowl float, and air/fuel ratio, etc.. tomorrow also uploading pictures of carb in next reply

 

 

Your fuel lines look like you are not using a mechanical pump, are you using an electric fuel pump?
As already stated, if you have 10 PSI, it's too much.
Once you have the correct pressure, check the float levels.
You accelerator pump does not appear to be correctly adjusted. Watch this video.

 

Yes it is an electric fuel pump, also will watch the video now, any information is good information

 

What rpm were you at doing 117 mph

 

No sense in adjusting the carb until you have established a proper timing curve as Jebby pointed out. You'll just end up chasing your tail. But do get that fuel pressure reduced and check float levels, first.

 

Based on your pictures I do not see a vacuum advance diaphragm on the distributor.
If so, that is not the correct distributor for a street driven car.

 

So I have fixed the timing 37 total. However, she still dies if I press the gas all the way down from a complete stop? After fixing the timing I went back over the carb parts (jets, idle, air/fuel, acceleration pump(0.015 gap at full throttle), etc) what else could cause this?