Ok lads, I think I f'd somethin' up here. I recently installed my 69 440hp with a brand new engine harness. I wired a summit ignition and coil into a msd dist. with new 8.0 street fire wires. I mixed up the plug wires. The motor bounced around pretty good, backfired, popped, and a nice little flame burst through the carb. I sorted out the plug wires now the engine runs like I'm missing a cylinder. I pulled all the plugs and they are all black. I'm also getting a good amount of white smoke which is I'm assuming unburned fuel. It starts up and idles ok but rough. What do you think I ruined? I'm workin on it now tryin' anything to smooth it out. 2:30 pm. pacific time.

running a holley? a backfire can wreck the power valve. when that happens, it won't run right

thermoquad 850

what did you do about the fouled plugs? at the very least, you need to clean them up

Please tell me this ain't a new engine/cam breakin. I'd check the wires being especially carefull with #5 & #7. Clean the plugs/check reluctor gap/set initial. White smoke is either ALOT of condensation or a coolant leak.

Problem solved. I guess when it popped it created a leak with the gasket under the carb. I replaced and the thing is bitchen again. i always look to deep into this stuff. The answer is usually in front of your nose and pretty cheap. Thanks Vinnie. Say hi to Marcelus.

Nope. Engine was broken in a the speed shop down the street. funny thing when I cracked open the dist. the metal ring with the fins (reluctor?)was totally rusted up. Cleaning that helped as well. Thanks for the note. TT