I was posting a lot last week, Ive made some progress since then-
My holley 6221-2 2300 series carb that was giving me headaches turned out to be an inverse idle circuit carb- there is little info on tuning these properly, and even after I rebuilt it it seemed to drip fuel more than spray it.
I bought a new holley 350cfm 2300 series with manual choke and put it on. After doing research on here about jet sizes- people like 54- 61 with most aligning behind a 56 or 61- I found that the carb comes with 61 jets. I left them on, along with the stock acc. cam.
I got the engine with a single header that dumps into a 3" collector and it came with a 3" pipe to a magnaflow muffler, then 3" out the back. I knew it was too big, but I thought maybe the setup was dialed in so I put it on. It turns out that this setup needs some tuning, so today I went and spent too much at a Meineke to have the pipe stepped down to 2 1/2" with a flowmaster 40 series.
I was hoping that my problems with high idle/ low idle in drive with brake on might be helped with a little less silly exhaust system, but it isn't too much quieter or more torquey.
The motor seems to run out around 3000ish at more than half throttle- Im guessing lean, but I don't know- it sounds good accellerating up to there then seems to stutter a little bit
Also it is wanting to die when I stab the throttle from idle. I'm guessing too rich of a shot from the acc. pump cam. It takes off nicely once it is rolling around 1500rpm
I set the timing at 600rpm in Drive with the advance line pinched off and the brake set at around 4 degrees btdc.
I still am having trouble getting the car to idle smoothly when I first come to a stop. At first it wants to die, so if I use two feet to drive I can poke it gently to keep it alive and then it settles into idle at 500-750 rpm. It is a little smoother than before I changed the carb/ exhaust. Any suggestions? I think if I had a manual trans all these issues would be inconviences instead of drivability issues, but thats got to wait until summer.
I hope that however this engine is set up, it hasn't moved the power band so far up the rpms that the stock torque converter is useless- I am having to idle it around 1500 to get it to reluctantly idle in Drive at at stop, and it bangs a little when put in gear!
any suggestions from people with similar setups are like gold to me! Especially if someone has encountered the same problems
Kevin