Bad RPM related vibration

It was A LOT.  When the PP came back it had a 3" long piece of 1/4 steel welded to one side.  Its been a while but it was something like 4 0z.  Not anywhere close to the half a gram that the rod ends, rods pistons were set up too.  I'm not comfortable with the PP problem because it ran smooth until the over rev but no parts were missing from the PP.  The pilot bushing makes sense, the whole thing turned to dust except for the steel outer sleeve.

Used another shop to balance this motor.  Sending the centerforce PP and clutch in to be checked for balance.

John


Edited by nosigma - Nov/28/2011 at 9:44pm

On time on six had broken valve spring and didn't pop or hammer and ran ok, but never felt right and never was smooth, put on engineizer and cut out cylinders real couldn't pin point in and then did leak down and comp checks was ok but then remove valve cover and check push rods ok, check spring height with set of calipers and thats how found it broken corner off valve spring and it had aftermarket springs. One time had happen on stock 360 in wagoneer once. Garage put cam in they thought cam was worn and replaced it and wouldn't run any different and gave up and gave to me check and was on number 8 cylinder. And then two weeks later different spring gave out in different cylinder and ending up replacing them all. Funny things has happen and did over rev it is possible. Check valve train.  Just my two cents. Good luck.

  I had a part of the clutch or pressure plate make a small hole in the bellhousing when I missed a shift,  neither blew,  but I had sytoms like you until I replaced both.    I didn't notice the small triangular hole ( 1/2 in.) until I took the transmission out.

John, use a dial indicator and see if the bellhousing is running on the crank centerline. It may be out. Very common on the 8 inch deep blowproof, not sure about others.