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I agree with Dadsbee, get a mechanical gauge first to make sure you don't have an engine problem, with your oiling system.Since once your engine is warm and reads low, doesn't sound good from what u have said.
Hopefully it's your sending unit.
I don't drag race this car, just a fun car to drive, and I prefer racing ( only a couple of 100 feet) non mopars just to remind people how they performed back in the day.
If I put this combination into an A body, it would have alot more top end.
I have a 73 roadrunner, the original 340 sits in the corner of the garage. The 340 in the car was punched out 40 thousands, at 11 to 1.I switched to a steel crank from cast shot peened, internal balanced now, I'm running EX 274 comp cam, with 3200 stall torque converter and 4:30 gears in rear...
Have you tested your new master cylinder to rule it out, even though it's new, could be bad. Try blocking off both lines coming from it and your pedal should be hard as a rock. If not, it's a bad one, this has happened to me. If it's good u have air in the system if everything else looks good.
The only problem is if you have a short in the system, your car will light up like a Roman candle. There's a reason why if you go to a higher amp alternator, you should increase the cable size to match that. Take it from an electrician.
I agree, installing the accumulator spring will soften your shifts, a fairly easy job. I haven't checked, but do a search on YouTube, much easier to watch a video than reading!
You should watch that video again, he did refer to using a fuseable link and what gauge size, inaddition he also said you can use alternative and one more thing he said he's not the expert. Like I said if you are worried about misinformation, post a video on YouTube and teach the young people...
Sorry pal, I haven't said much, hate to spoil your thought, I am an electrican by trade, I probably forgot more than you will ever know. Furthermore, You tube is a good tool, is great for someone that is learning.
Don't go to a bigger alternator, unless you up grade the wire coming off it, a good chance of creating a roman candle ! Better yet Dead Dodge Garage just put out a video on this subject on YouTube, as a matter of fact he's also a member on this site, he'll answer all of your questions. Check him...
Listen to the people who bought from firm feel, I bought a pair of torsion bars for my 73 Plymouth and very happy with results. I would buy again if I had from them, can't go wrong.
No point in saying anything, you got already a ton of advice, great to admit u r not sure, every one on this site, loves to help. Congratulations and don't give up, it's all part of learning, we were all there at some point!
If you don't know the stall of your converter, it's a very good idea to run a cooler, besides it may extend the life of your transmission.
If your car is running hot, you need to further investgate, is your rad in good shape, are your front brakes dragging if calipers instead of brake drums. I...
This is a scary topic since seeing so many failures. I have an comp cam extreme energy EX 274 with flat tappet purchased 20 years ago and still working great. I wouldn't change it for anything new, unless it was new old stock.
Good luck!
Just reading all the comments, everyone of them may be right, write a list and check it all, also check the flex plate bolts to make sure something is not coming loose, very common if no lockite on the bolts. It wouldn't hurt to do a band adjustment on the transmission also. Great videos on...
On a final note, make sure your ring gear is the same thickness as the original or u will have to get the center pin machined so axles will fit with c clips. In addition if u buy new should have a diagram showing how much to machine off, very important for machine shop. If it's a thicker ring...