is anyone running dart iron eagle heads 200 or 215 cc heads,for some reason i keep fauling plugs, ive done every thing to the carb that i no to do,like the power vavle jets fuel mixure srews,and its still braking up on me at 4000 rpms,im not sure if im useing the right plug or not, so if any of you guys are running these heads please help,im using ac delco r44ts

 

also im running holley 4150 650 dp with performer rpm intake 1.6 roller rockers comp extrem 274, 230 236 at .50 and 488 490 lift,

 

Sounds like you have 2 separate problems.

"Breaking up" I'm going to assume means that the engine suddenly begins to run rough. Most of the time this is because of valve springs. What valve springs are on your heads?

Fouling plugs is almost certainly due to the carb. Try borrowing a carb from somebody and see if that helps.

It's also not impossible that your spark is weak, and that it goes away at higher RPMs. What is your ignition? Have you tried substituting parts?

Those plugs should be OK as a starting point for tuning.

 

the vavle spring are 1.437 duel,im also running msd pro billet dist and msd 6al and blaster 2 coil with the msd 8.5 super conductor wire set,also the car starts braking up its like to much fuel or not enough when it starts doing it if you let off the gas petal the car will stall,also it only does this at 170 or hoter temps

 

move up one heat range on the plugs. r45ts i had a 4k break a long time ago. thought it was valve springs. turned out to be the coil.

 

what is your initial and full advance timing at? Also do you run vacuum advance? Another thing is, have you ever leak-tested your carb?

 

i think we set the timming at 12 and 37 total,i do not use the vacuum advance