Distributor pushing up hard on rotor?

[Chryco Psycho]

 

[Cudakiller70]

AT least the black cap has brass contacts !
 under the foam in the top of the center shaft there is a small snap ring that holds the upper shaft onto the lower shaft , if that snap ring in not seated or even there the upper shaft can float too high upwards so make sure it is in there , obviously you have a lack of clearance so it could be anywhere from the body being machined too low or the shaft being too long or the cap miscast to short or the center button position too low or ....

Snap ring there and seated.

Will try a different cap and rotor, hopefully miscast parts is all this is.

[Cudakiller70]

I would also confirm that the rotor is 1 not too loose and 2 not too tight preventing it from fully seating on dizzy shaft.

Just compared the old and a new rotor, both to me fit well. Compared the two dimensionally they match, so looking like rotor is not miss cast.

[Cudakiller70]

Play-do shows clearance between rotor top and tab. The before with no up push on shaft shows a little clearance and the after shows play-do squished away. Looks like that .020 shim would help maybe just enough.

[Cudakiller70]

Thanks everyone for your help. 
 I'll be sure to get electronic cap and rotor. Will install some shims and hopefully that will make it

[73_Cuda_4_Me]

That definitely seems like awfully tight clearance... hope the new cap helps... I'll still get you some dimensions from the stock one I have for comparison...

[AARuFAST]

After market distributor.

Do you have a local Dodge dealer?
Our Dodge dealer has old school parts people and know there s...

Don't go to local parts store for parts.

Questions.  How long was rotor and cap used before this happened
1 does the rotor have a metal clip or notch inside of it.
2 something caused the rotor to chew up the top of the contact inside of cap....never should rotor make contact with distributor cap firing points
3 Rotor shows it was arching at right point at one time.

[Cudakiller70]

After market distributor.

Do you have a local Dodge dealer?
Our Dodge dealer has old school parts people and know there s...

Don't go to local parts store for parts.

Questions.  How long was rotor and cap used before this happened
1 does the rotor have a metal clip or notch inside of it.
2 something caused the rotor to chew up the top of the contact inside of cap....never should rotor make contact with distributor cap firing points
3 Rotor shows it was arching at right point at one time.

Nearest Dodge dealer 30 miles away.
No history on this distributor, car is new to us, only driven 150 miles if that.
No metal clip inside of rotor, just a notch to line up with shaft.
I don't know if the arc pattern is normal or not, but does seem a little funny how it's a wide/tall then a flat thin line.
At this point I've got nothing, will shim distributor shaft, get the right cap and rotor then go from there.

[Chryco Psycho]

what about just trimming the rotor down so it sits lower om the shaft , it is just plastic , easy to file down

[Cudakiller70]

what about just trimming the rotor down so it sits lower om the shaft , it is just plastic , easy to file down

Good thinking, I wonder if rotor is bottoming on shaft, will have to check maybe the shaft notch is shallow? Really don't need a whole lot  This has got to be a bad knock off a distributor that's out of spec.  First I'll check rotor seating depth, then try shims and a new cap & rotor and see what the clearance is on the bench.
Thanks CP

What do you think of the GM HEI conversions?
What are your 2 choices for distributor ignition systems, best bang for the buck?

[tman]

I have been really happy with the Firecore Electronic distributor.  They have others, but if you just want to keep your Electronic ignition and just change distributor, this is a good choice.  Then I added the Rev n nator,  I have been really happy with this combo. 

https://www.customwiresets.com/home.php?cat=308

[Chryco Psycho]

GM HEI was always bad , the modules failed constantly , also the wiring inside failed with the advance plate movement & most gms were limited to around 5000 rpm & would not consistantly provide spark above that  Great downgrade IMO
 Second vote for Firecore 

[AARuFAST]

Nearest Dodge dealer 30 miles away.    BUMMER
No history on this distributor, car is new to us, only driven 150 miles if that.  REPLACE DISTRIBUTOR FOR FIRECORE
No metal clip inside of rotor, just a notch to line up with shaft. NOTCH CORRECT IN ROTOR
I don't know if the arc pattern is normal or not, but does seem a little funny how it's a wide/tall then a flat thin line.  ARCH PATTERN IS WIDE/TALL BECAUSE ROTOR IS FLOATING UP AND DOWN ON SHAFT  ROTOR SHOULD BE SNUG ON SHAFT
At this point I've got nothing, will shim distributor shaft, get the right cap and rotor then go from there. REPLACE DISTRIBUTOR AS OTHERS HAVE MENTIONED

[Cudakiller70]

Thanks everyone for your help and advise.  Got pulled away from the car for a bit, will let you know whatever I end up doing.

[tman]

If you are thinking of a new dist, Mancini has 10% off this weekend, Fri-Mon.  They sell the Firecore dist.  Discount code #LaborDaySale