[bowtienut]

ok this is what i have, a 1971 vega W/a 8.2 rearend from a 1969 camero, 410 gears, 26x10.5x15 mt et streets, engine is a 350 sbc 30 over dome pistons, heads are protopline torker 202/160 iron. comp. is 11.25:1, roller rockers, cam lunati bracket 515 lift 300 dur. intake- performer rpm airgap, carb holley 750 dbl pumper, trans. th350 b/m shift kit, torque conv. b/m 2500 stall.

what it does; on the line i can get to 1800 rpm on the stall, nail it on the light and i got three reation times of 049/051/049, but it stumbles and trys to die. very embarassing!!! 60 ft times are 2.7, after the 60 ft mark the car runs like a scalded dog!!! best 1/4 mile run 13.2 w/ 2.6 60 ft.

please give me some ideas...

thanks

[77z]

Whats your fuel pressure like at the line and what pump are you runing? Float levels are fine aswell ?


Regards Mike

[Bumpstick]

I`m thinking float levels too... Hard launch and a quick short bog means the front bowl is set to high... Try setting the fuel level in the front bowl to the very bottom of the sight (hole or window...?) and the rear should be rasied just a little (somewhere around the middle...?)

[slow ride]

I had the same problem. You need ALOT more stall. I'd say 3500 at least.

[black66]

I agree with Slow Ride. Your stall is one of your problems....3200 and up would be better.... I am running a 3200 custom built stall with a 355 sbc. 11.2 compression with a .600 lift roller cam. My launch is excellent with no tire spin at all.... I had a B&M stall rated at 3200 - 3500. My motor pushed it above B&M's range to a 3800 stall. 3800 is straight tire shredding in my car.... Spend the extra cash and have a stall built custom for your application..... You will not be disappointed...

[killerformula]

i'm on board with the stall converter, the more stall you have, provided you hook up, the more consistent you're going to be. 3500 or 4000 would be fine on slicks. Furthermore, floats and pumpshot are probably an issue. How fast is your timing coming in?

K

[Smoked Rubber]

Sounds like your car is Hooking up and bogging the engine down from the Tires almost, but at the same time It also sounds like you're getting too much Fuel and or not enough spark to burn it all. Check the Advance Curve on the Distributor and the Carb, The carb alone seems a little Much for a 350 (355) SBC, What kind of Distributor do you have and Whats the Timing At? Do you have Advance Curve Kit installed?

Carb Adjusted Correctly?

[edge]

More stall wouldn't hurt. But with a 4.10 gear, 26" tall tire and a 2500 stall (currently) and that engine/car combo; the stall alone would not produce such poor 60' times.

I would start with suggestions made regarding tuning the carb and spark curve, then consider another stall. If it is hooking up, you should be able to knock off at least a second on your 60' times. I have a Camaro that weighs 3640# with me in it. With a 4.10 gear and 28" tall tire I can get 1.7xs pretty consistently. Fix that 60' problem and you should be deep into the 12's (IMO).

Best of luck, Ed www.edgesz28.com

[k-star]

The stall of the converter will not make your car stumble.....

I ran a stcok converter with about the same cam and had no problems with a stumble ( the 60' times were not great but no stumble)

What is you timing curve, Initial,total, and where is it all in by????

Does it fall flat and then pick up???? or does it react and then fall off?????

Have you done anything to correct it yet????

keith

[NDNslicks4me]

The carb is slightly large(probably out of adjustment slightly) and the stall slightly low.... but if you are only stalling to 1800 on the brake then bogs as soon as you accel it sounds like the brakes are not holding the car.

That is believe it or not where I'd look (if you can't tune it out). I'd be trying to get the brakes to hold the car so the throttle can be pressed much farther down (if not all the way to the floor) while you are at the tree.

am i correct that the brakes are not holding the car?

[bowtienut]

WOW, a lot of ideas thanks guy's, the ignition is a MSD 6al 7000 chip iam shifting at 6500, the timeing... all right don't laugh at me i'm not real savy when it comes to timing, msd distributor, out of the box, no adjustments, set timing at 8 degrees at low idle w/ vac. line off and pluged. Oh, msd wires also.

holley carb, i set the float levels at the bottom of the site hole, i had a 600 edelbrock on the car at one time, but it would run out of fuel before the engine hit 5000 rpm, i am running a holley red pump for fuel.

electric water pump and fan, no belts on the engine, yes hot battery always.

i am sooo disappointed this car is not doing better than it is, i really thought i was gonna have a rocket!

thanks for all the help guy's

[edge]

Originally Posted by bowtienut

.. msd distributor, out of the box, no adjustments, set timing at 8 degrees at low idle w/ vac. line off and pluged.

Make sure you have 34*- 36* advance at WOT, no vacuum connected. MSD out of the box, you should have your initial timing set at like 13*-15*. For MSD states their distributors come with 21* of mechanical built in (blue bushings)

What model distributor do you have? Here are the instructions for the Ready-to-Run #8360. They are very good and detailed. http://www.msdignition.com/pdf/8360_frm%2023793.pdf

From the factory, MSD distributors use the two heavy springs (silver) which is a slow rate of advance. With the blue bushings and two heavy silver springs, you do not get full advance until like 4000 RPM (Chart A).

I'll bet if you set your initial timing to 13*-15* (for 34*-36* total at WOT), and use maybe the two blue (light) springs, you will see a world of difference. The two blue (light)springs with the blue bushings will bring in all your advance by like 3000 RPM (Chart D). You may even want to try one silver (light) spring and one blue (light) spring. Chart E says that you'll have full advance at like 2500 RPM.

Ed

[k-star]

Ed got it,,

Go to school right now and learn about timing your engine correct, buy a good light and ask questions.

I bet 95 percent of your issues go away with the correct timng curve, unless the carb is out to lunch... But start with the timing first..

Keith

[77z]

Go Ed you saved me a bunch of typing

Regards Mike

[GoneNova/406]

no one here asked you what trans you are running.is it an auto?if so you may want to check out some articles at chevy high performance and super chevy on line about the governor kit for the th-350 and 400.you need a converter to match your cam.call your cam company for that info then get hold of a converter company.i match my cam,converter and used the governor kit and what a difference it makes.the governor kit allows you to leave it in drive and make the same run time after time as long as you get it adjusted right.you need to go to holley.com and get some help in tuning or the stumble also.good luck