Alekb

I did both tests and for the first drop test the front piston dropped slower, however the gap between speeds was smallest with the original piston orientation at about half a second between them. I did the rise test and they dropped at nearly the same rate.

Plugs from cyl 2 and 5

Hi guys, about a year ago i bought a 1974 260z that had an N54 l28 swapped in, it also was converted to 4 screw round top su carbs. I rebuilt the head and the carbs. I got it running last spring and it idled great but whenever i tried to accellerate hard it would hit around 3500 rpms and then start to stutter, cough and die, almost like it was hitting a limiter. I did some trouble shooting and ended up trying a couple pulls without air filters on, and the z ran great, I could pull way past 4k and more without any stuttering or coughing. I thought it was the stock air box restricting air for some reason, so i bought itg air cleaners off of MSA. Even with the performance cleaners the issue persists. I've checked ignition timing and it is around 10 degrees advanced, I'm really at a loss and have no clue what could be the issue any help would be greatly appreciated