12 na starting issues
 

A year ago we shattered a plug which took out the apex seals in the 1983 12a motor we run in our sand drag car. I sold the motor which I paid $300 for and raced for 8 years for $250 and found another 1983 12a for $300! Installed the motor and found the twin dizzy dist had a bad igniter. Spent too much time looking for a dist or parts and finally ended up putting together a crank trigger system utilizing an MSD 6-Al box with lead plugs only.

The car started and idled better than it ever had and had great throttle response. . Took it to the races a couple of weeks ago and on my first pass had, what I thought was a nitrous solenoid stick open and flooded the motor. I am having second thoughts on that theory now. Pulled the plugs cranked it until it stopped blowing fuel out the plug hole, put new plugs in and it started up only to bog down and stall then apparently going into carbon lock. It took 4 days of WD-40 and hand cranking to free it up, another two days to get the oil out and get it to stop soaking the plugs.

Now the bigger issue. Some times it will start. When it does, it runs good for about 20-30 seconds and then bogs down and stalls. When I go to restart it the motor turns over like it's really tight, almost seizing up. Changed battery cables, battery is fully charged deep cycle, put in new starter, no difference. I have a good strong spark. With the plugs out cranking it, I get alot of black fuel spray out of the front hole and none out of the rear. When cranking it over I get what looks like black smoke out of both pipes. I tried the back up carburator and no better. I have not done a compression test but both holes have alot better push back on a finger test! and when it was running before the race, I had equal strong exhaust pressure and both plugs burned very clean. This clip was shot before the race.

http://i272.photobucket.com/albums/j...ps4a27d9c7.jpg
Any thoughts!