small block chevy breaking up under load

[lilsuperchargeds10]

I have a pro charged small block chevy that keeps breaking up under load and just noticed that the spark plugs are all black.

[maxwedge]

Welcome AF, too rich, fouled the plugs, too weak an ignition system to fire the higher cylinder pressures, wrong heat range plugs are some possibilities.

[Torch]

I would try leaning out your air/fuel mixture a little bit, either you are getting too much gas into the cylinders or the ignition system is malfunctioning and isn't creating a hot enough spark to ignite the fuel properly.

[lilsuperchargeds10]

thank you ill try all of that but i am running a msd 6al boost box and high output coil with a msd billet distributor. think i should lower the jets in my carb to.

[Torch]

Try hooking a spare spark plug (of the same kind that are in your engine) up to one of your spark plug wires and see what kind of spark its getting.