We ran at the track yesterday. The car did fine until we got to the top of second gear and all the way through third there was a very slight miss just enough to here it. We can't find anything wrong don't know if it is gas or fire. Has anyone had anything like this before. The motor has all msd ignition it is a mild 440 with around 11 to 1 comp. 557 solid cam 1150 dominator.It has a torqueflite. What do you think?

I'm no guru but with the displacement and cam you stated I'ld say you have to big a carb on it.

is the miss still there? that happened to me once and scared the poop out of me as i was an 8 hour drive from home. turns out my timing tape flew off and got sucked into the carb (ran without air cleaner)

Could be a fuel supply problem. That dom may be wanting more fuel than its getting. That, said, i ran a dom with just a carter mech pump and 3/8" line in a 550 hp 440 Challenger and it worked fine.

It did the same every pass. We were thinking if the carb was too big it will show up more off the line at lower rpm!

It sounds like a fuel issue. May I ask what size fuel line your running?

Is the carb up through the bonnet and are you running a scoop.

We run holley blue pump half inch line six pound of pressure.

We do run a scoop

I had amiss once that turned out to be a dirty filter...just sounds like after going thru first and top of 2nd, that your fuel system is not overcoming the enertia thats trying to push the fuel in the line back.

could it be lean?

I had a miss in upper RPM's and Rick from Firecore custom made a set at the Mopar Nats. No more miss fire plus he is a member here.

I ran a very similar combo in my, otherwise stock '69 Road Runner. I could give you my exact incremental info from a number of runs. I was running a Weiand CH4B intake with no spacer. I ran in the 12.40's on most passes. The car had 4.30 gears and a 3500 RPM Converter. When I swapped to a friend's sorted out 6-pak, the car went 12.11.

May I suggest you check the float level in the carbs bowls? If the float level is too low, you will see the problem you ran into. If they are too high, the car will act strange as well. Set the floats. If you have 6 pounds of fuel pressure you should be in good shape. Make sure the 6 PSI is achieved while going through the traps. Good luck.

One more thing...What timing are you running? Check to make sure the timing is actually where you want it to be.

If it spits through the carb...it's an ignition thing.

If it spits out the exhaust...it's the carb.

Try bolting on a friend's working carb, or carb/intake combo. That cured a ton of my problems. Tom