now that i think about it, there are no alignment holes or pins for the clutch plate

 

The stuff I have is super easy...You press a button put down the remote come back in 10 minutes the plane is waiting overhead for you to land it...set her down and pull the photos off the camera of the 50 acres of land you had the plane fly over and generate a mosaic photo of that plot a of land

And yes Billy make sure you did you the 351 fire order as jcoby suggested...I had missed that were you mentioned it was a 351 equivalent cam. Hopefully this solves the issue.

-Gun

 

Okay but the pressure plate can only bolt on one way right? Did you have to keep rotating it until all the holes lined up or did you just set it on there and bolt it down right away?

-Gun

 

You could have a combination of things making it so bad. When it comes to vibrations, there are SOURCES of vibration and then there are problems that can AMPLIFY vibrations.

Imbalance is most likely your SOURCE, but it is also possible that it could be amplified by a bad motor mount or something else transmitting the vibration into the passenger compartment.

Don't get me wrong. If you have something amplifying or transmitting the vibration, you still must correct the vibration, but along the way you need to correct whatever is transmitting or amplifying the vibration.

With some certain German cars I have seen motor mounts go bad to a point that you think the engine is about to tear out of the car. It then turns out that there were no vibration problems from the engiine, rather a bad motor mount.

I have never seen this on an American car, but that doesn't mean that it couldn't happen. Make sure that your motor mounts are in good shape with no metal to metal contact. Remember as the engine speeds up, it torques over a little, with a load it torques over alot. A marginal motor mount could be going metal to metal at some point, but be riding on rubber at idle.

Good luck,

 

I will check them. I did replace the mounts when i installed the engine and the vibration has been there since day one. I will look though.

On a good note, I found a great shop here that is extanding a fox driveshaft by retubing it, balancing it to 9k rpm's and replacing the u joints for $120.

I think it is a great price.

 

Great price on the DS...

Sucks about the vibration. What motor mounts did you put into it?

Also, have you contacted the machine shop that did the balancing of your rotating assembly. If they keep any files of the work they have done, you should be able to get a balance sheet and find out exactly what they did to your motor. They may have screwed up and balanced it for a different weight flywheel or even did a full internal balance and you would then need a neutrally balanced flywheel and damper.

They would be the first ones I would talk to at this point.

Good luck!

 

Zenith
I used stock replacement mounts.

I am going to get in touch with the machine shop tomorrow to get the balance sheet. I wouldnt doubt if they f'ed it up. they messed up the valve train as well. that was a tough lesson to learn.

 

If you replaced the mounts, then that should satisfy the issue. Did you also replace the transmission mount?

 

on a note, since you have the T5. In my case I had to increase the shifter hole. The rubber was touching the floorplan where the shifter was. That made for awful vibrations

 

I am fighting the same thing. Just installed the 351 Cleveland in the mustang, got it running a couple weeks ago sounded great but... vibrations just as you are explaining. The motor has been rebuilt and built up a bit, I don't have any info on who did the machine work and don't have any info on the previous owner anymore. Previous owner had it in a Fox body running good. I bought the complete motor minus the flywheel. I installed the 28oz that should be correct to the 351C. The only thing that has me wondering now is that when I opened up the motor to check all the lower end I noticed that the crank had been drilled out quite a bit on the large counter weights. Figured they balanced the lower end. Soooooo, at this point not sure if I need to get a flywheel that has no counter balance due to the crank wor or what. I haven't had time to tear the tranny back out to look further into it. Wish you luck, but it sounds like you are having the similar problem as me.