sbc 400 stalling out need HELP

[INSIDIOUS '86]

well youve changed the carb and had no diff as well as fuel pump intake and ignition, are you running an msd or super coil?

[southern gator]

im useing the coil style that mounts in the top of disributor cap. Ive tryed napa's regular coils, and i have tryed the highout put style coils, anit making a change.

[southern gator]

anymore info/help guys?

[southern gator]

????

[INSIDIOUS '86]

well youve changed plugs the distributor and carb and intake gaskets so idk what else could be going on, do you have a msd box or something similar?

[notyo_cheez]

Do you have a riser under the carb? Add one if not, could be fuel is heating up and you have vapor lock. Or, your choke is acting up.

[southern gator]

yeah i have a riser under the carburetor. all good, i though it was vapor lock to but if i open the gas cap when acting up no air no change.

[J Knight]

Years ago my x mother inlaw had a 73 buick lasabre that started running real bad, we messed with everything we could think of and then some, we were stumped. As a last resort we droped the exhaust after the y pipe, it ran purfect, we could roast the tires easy, the exhaust pipe collapsed on the inside, installed new exhaust and no more problems. (car never had cats)

Any way hows your exhaust? I think we are all running out of ideas.

[southern gator]

im running headers with dual 3" exhaust, to the cab, with cherry bombs and turn down tips. yeah im so stumped im fixing to put another motor in it lol

[INSIDIOUS '86]

well to fix your prob i say throw some dish soap in the oil after draining all but a little and throw some quarters in the intake and then swap in the new engine lol

[southern gator]

lol well guys thanks for all the info. i guess its engine time

[southern gator]

before i pulled the motor i sent the truck to a buds shop. They checked carb, timing, heads, valves, they installed a fuel regultor cause my stock mech, fuel pump was putting out 12psi of fuel. now its set at 7psi. But still running like crap.
NOW they installed two distributors no change, but the 2nd distributor they disconnected my vacuum advance "no more vacuum advance" set the timing and it runs perfect. they reset my timing, drove and no problems, i also had to change to a mini starter so i could turn the motor over now cause its advanced in timeing. But i cant get a str8 answer from the shop or anyone, why did i have to change from a stock distributor with mech. vacuum advance to no mech. vacuum advance???

[1LowToy]

Sounds like you have hit all the obvious things except the motor internals. You say the motor has been rebulit within the past 800 miles. Could the valves be adjusted too tightly? I have recently come accross a motor that wast rebulit by a so called reputable engine builder and found that the minimum wage man did the valve job. He ground the valves and seats too far and the springs did not have any shims. So everything looked good but really had no compression to speak of. Oh he ground the valves till there was nothing left and the seats were so far down it must have added some CCs to the chambers. The shop that built the moter had no explanation other than he's built race motors for years

[southern gator]

well while i had it at this shop last week, they pulled the heads and redid the valves and guides. So yeah it had valve problems but now fixed, its got 150 compression. but still only thing i anit messed with it the cam, lifters and bottom end of motor??

[INSIDIOUS '86]

cam may be timed wrong? they prob changed the cam chain and didnt degree the cam in the right way

[southern gator]

well the place i just toke it to didnt mess with my cam or chain. but i think the reason why the stock vacuum adavcane anit working is im having a cam or cam lobe problem, sound right? truck runs good now just anit got vacuum advance