How bad would an engine run if……

[RemCharger]

I had thought all 383’s were forged cranks?

Nope. Some 71s. I thought it was just 2bbls, but have heard some both.

 

[33 IMP]

I had thought all 383’s were forged cranks?

I think 71 only. Same time as the compression reduction.
Darnit. Didn't even see Remchargers post. Just had to open my big mouth after seeing #20. Oh well.

 

[pnora]

I had thought all 383’s were forged cranks?

Nope.

 

[6872n73]

Check out David Freiburger's you tube channel when he bought a 72 roadrunner, it had a vibration at speed with a motor home 440.... Caused by wrong weights on the flywheel.


Edited to what I meant to say.

 

[YY1]

Before I figured out the problem, I had a 1977 trans from a 400 behind a 383.

Fine until 50 MPH, then terrible, I mean TERRIBLE shake that didn't go away until 110!

 

[Lefty71]

shake that didn't go away until 110!

I love your repair methods.

 

[RemCharger]

I love your repair methods.

Did that when I was a kid. Shake completely went away after the driveshaft blew off at 95.

 

[Dodge-Scatpack]

A 1st order engine vibration can be very detrimental and destructive to the engine’s bottom end. I wouldn’t ignore it.

 

[Moparfiend]

Well new u-joints and balanced drive shaft and the vib is gone. I still get a small low frequency drone at 55+ but I am not worried about that so much as it’s not real noticeable. Bigger fish to fry kinda thing. I know some people chase that drone in perpetuity……kinda like purgatory lol.

Anyway thanks for the help gents!
MF aka Ron