428 flywheel index relaive to crank

[ScotiaFE]

Does the vibration get worse as speed increases?
Where do you feel the vibration? Wheel, pedals, seat, mirror shakes, things like that.
The driveshaft.
By indexing, did you mark the driveshaft and put back in the same spot?
Is this the original drive shaft? They can and will start to bend after 50 years.
Did you change the pilot bearing in the crank?

[machoneman]

Yes, get rid of that wheel pronto! Sounds like the shop butchered it up to "make it fit"...always a very bad idea with flywheels, clutch covers, etc.

[Rob Roy]

The vibration is constant no noticeable difference through rpm range.
FYI I did install JBA headers while the engine was out.  Close fit but no contact. (Remember to reverse idler arm bolts so the Head is inside engine compartment)
Its not a motor mount, I had one go bad in a Torino so I know all about that.
I just pulled the drive shaft, every thing feels smooth.
No I did not think to index the yoke when I replaced the u joints. That vibration would be worse at a certain RPM correct?
I still need to remove the inspection pan to check orientation of the counter weight with respect to the crank counter weight.
I know its time for new flywheel.  But the only reason why they must of fiddled with the holes is for balancing.  Bozos
So a new flywheel will not do me any good because I could still be out of balance.
I will keep you informed.
Thanks
Rob

[Rob Roy]

Ok Guys
Like I said I installed JBA Headers in the car, There the Tri Ys.
I was wrong I think they are contacting the top portion of the steering box.
Could that be it?
I characterize the vibration as annoying and not just light. hard to describe.  It is Not something that you get use too.
I have never driven a car with solid motor mounts so I cant even describe the level.
Rob

[ScotiaFE]

So this is not an engine balance problem.
Well that's not actually true.
That big ugly fan is out of balance for sure.
But I digress, an imbalance with a flywheel is very noticeable
and will shake the whole car/engine/trans/shifter and the mirror will fall off.
At least that's what I have seen.
Me thinks you may have a header bumping the car.

[Rob Roy]

OK there is like 0.010 to 0.015 in clearance between the header and the top of the steering box.
You mean to tell me that is causing the constant vibration?
I need to have a good feeling of what it is before I remove the trans, bell housing etc. from underneath the jacked up car.
yes I still have to bump the engine over to see where the flywheel counter weight is to the crank.
I removed the inspection cover and everything is tight.
Thanks
Any more insight?
Rob

[ScotiaFE]

I'm just saying, if the flywheel was flopping around
you would feel it very hard in the shifter.
If the floor pan or the some noise from under the car is bugging you?
Then it is most likely some exhaust bumping against the car.
And in a old Mustang with very little of anything really to keep the sound
and vibration down a header bumping against the car and if you are not
used to it can be quite loud. jmo

[jayb]

OK there is like 0.010 to 0.015 in clearance between the header and the top of the steering box.
You mean to tell me that is causing the constant vibration?

Stick some kind of a cushion in between there, like some header wrap or a gasket, and see if the sound changes.  If it does, you know that's your problem.  That small clearance could easily be causing the problem.

[Barry_R]

We did a 347 for a small block in a 65 Mustang fastback.  Pretty stunning black car - no expense spared.  Externally it looked exactly like an original hi-po engine - we even hollowed out the counterweight with the Bridgeport to get a +/- zero balance deal and keep it looking "correct".  Motor was glass smooth on dyno - we were concerned about our creativity and checked it over a lot at various RPM just to see.

Had a vibration in the car once the customer installed it.  Tossing the Centerforce clutch fixed 70% of it.  Spent days trying to find the other - removed all the front dress, fan, pulleys, ran the engine "naked" without the trans in it.  Finally discovered that the driver side motor mount was just kissing the repro hi-po exhaust manifold.  Turns out that hi-po cars had a slightly different motor mount along with the manifold.  Two minutes with the die grinder and the problem was solved....

Long way of saying "yes"...