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904. Lenny at Ultimate built the converter for this car in 2018 so I suppose it's time for a freshen up anyway. Does anybody know if he still owns Ultimate? Last time I called them I couldn't get in touch with Lenny.

I think I figured it out. Went for a drive. At a stop sign I foot braked the car it would only stall to about 1,900. Floored it and it was a total dog, didn’t even spin the tires until we hit about 3,000 rpm. Torque converter is shot. Probably needs freshened up

Thanks for the reply. I don’t think it’s a timing issue because this car has always liked 20 degrees of initial timing. Thanks for the tip on the idle adjustment and I’ll try the eraser trick. Maybe those metering block gaskets do need replaced.

No, I’ve got a fuel pressure gauge on the cowl and an air fuel gauge. Pressure is normal and air fuel ratios are in line. Thanks for all the ideas though. This is what I was looking for.

I verified timing becuase it almost acts like one that doesn't have enough initial timing when you put it into gear.

Yes, I did verify 20 degrees locked timing the same day I did the vacuum gauge. Yes, I'm curious about a vacuum leak as well.

I've got a 71 Dart Street/Strip car with a 414 C.I. stroker and a procharger with a Holley HP converted to blow through carb. Been running this set up since 2019 with great results and doing dragweek a lot. The timing is locked at 20 degrees. Typically this setup idles great in park at 900...

Thanks for the help. After some reading and research, this makes sense. Although, I'm not sure my classic HP carb has screw in emulsion jets..... I know this is standard on the Ultra HP but I have the classic. Maybe I can get the fuel curve flat enough with air bleeds and main jets.

Thanks for the help guys. I'm going to try the larger main air bleeds and see if this helps. The carb does have the adjustable air bleeds so this should be fairly easy.

Hey guys I need some help. At wide open throttle the car is too rich at lower and mid RPM ranges. Like 10.5:1. By the time I hit 6,000 RPM its much better at like 12.0:1. This is a 360 with a procharger and Holley HP 750 converted to blow through. Running 10 lbs of boost. What would I need...

Update: called the guy that built this blow through carb. He also thought power valve staying open. He asked if the vacuum port on the main body was hooked to intake manifold vacuum/boost. It was not. That was my problem. No it's fixed! Thanks for the help and thoughts FABO!

Just had a thought..... Blown power valve? Staying open all the time?

Probably 1 turn out? I'd have to check, can't remember.

I set the 4 corner idle screws to highest vacuum reading which got me around 14.0 at idle. When you first put it in gear and start to move the AFR readings are still good. Get on the street and give enough gas to get up to say 20 MPH and it goes way rich. Stays rich at light throttle, even at 50...

Hey guys, I have recently installed a Holley HP 750 carb that has been professionally converted to blow through. Recently installed a P-1SC Procharger on my 5.9 Magnum build. Also, installed a water/injection kit to keep the air charge cool. I have a AEM wideband AFR guage. My readings are...

Just giving an update. I ended up going with aero motive -8 feed and return lines with AN fittings. Installed a 1/2 sending unit in the stock tank and installed a -8 bulkhead fitting for the return. Tank is back in and next up is running all the lines.

Thanks for the replies guys. I'm going to look into all these suggestions. I'll let you know what I decide to do. May be a week or two before I get to work on it again

Yeah I was looking at the aluminum 1/2 inch line. Pretty affordable but then you have to buy the $100 37 degree flare tool to use AN fittings. Oh well I'm sure I could use it in future projects

I'm adding a Procharger to the Dart and need to upgrade my fuel system. I'm going with a 1/2 inch sending unit in the original location in the tank. I'll also be adding a bung for the return line. Using an electric pump then Need 1/2 inch feed line to the boost referenced pressure regulator...

Nope it's perfect at cruise and wide open throttle. Basically got all figured out except the extremely light throttle froma stop. Going lean then but all other areas are great.

The IFRs are up top on mine. It's a newer 4779-9 model. I think I bought it new around January 2014. Not sure how to go about moving the IFRs to the bottom as you speak of. I'm still learning the carb tuning stuff so not sure what you mean on that. I think I need to buy that Holley tuning book...

Just an update. Removed the primary fuel bowl and metering block las night for cleaning. Used carb cleaner and thorowly cleaned every passage. Removed idle air screws and cleaned those as well. Put back together and my idle is back to perfect. Cruise no longer has a light throttle stumble. The...

Mderoy340, I will also clean out my IFRs when I take this apart. Hopefully an easy fix. Thanks for the tips and I'll report back with my findings.

Yellow rose. I was also thinking that drilling out my PVCRs couldn't affect the idle circuit. I do have the stock Holley metering blocks and I think they have the tiny screws in the top so I will try blowing those out. Haven't had time to take it back apart yet but hopefully tonight. Thanks

I also think it is debris in the idle circuit somewhere. Haven't had this stumble until Friday when I drilled my PVCRs. I'm guessing it's a coincidence, or possibly some of the tiny metal shavings? I used air to blow out the entire metering block after I drilled. Could a dirty needle and seat...

My 71 Dart has a 5.9 magnum with air gap intake and Holley 750 double pumper. Has always run great but I've been fine tuning lately with an air/fuel gauge. Been really nailing down my tune trying to get 14.7ish at cruise and still keep 12.5ish at WOT. Friday night I drilled out my power valve...

Put a Holley 110 gpm pump on last night. Pressure is now rock solid and the surge is gone!! Since I'm not running mega horsepower I think I'm going to leave my fuel lines alone.

Okay a lot of you know I recently put a fairly mild 360 magnum in my 71 Dart. I got the timing and carb issues sorted out so then I moved on to traction issues. Last night while doing a "hole shot" I noticed 2nd gear didn't feal really strong and the engine started "surging" at about 4,000...

I will try to take some pics tonight. Maybe with pics this will be more clear.

I had some time to tune on the car this weekend and I got the Bog/hesitation whipped! I unhooked the secondaries and found that part of my bog was there. I ended up with a green pump cam in position 2 with a 35 squirter in the primaries to cure that bog. I then hooked up the secondaries and...