I'd still do the plug lead test.
...and firing order coupled with direction of rotation of that firing order.
Harmonic balancer seperated?
it didn't vibrate before , you changed the crank and got it balanced and now it does , therefor it can only be the balance job they have done , the 400 is external balance so weighted damper and flex plate are required .
Assuming valve timing and ignition sequence is correct it does point towards the mechanical`s , compression tested every bore ?
Last edited by timbo56; 13-04-2017 at 19:03.
as i said before ian if they balanced it without either or both of the damper and flexplate fitted the assembly will now be internally balanced and the easy check is to remove the flexplate weight. if its better but not 100% fit a 350 damper to complete the smoothing.
need a job done on your project? i may be able to help.
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