I have another problem with my recent 440 swap. (I'm beginning to wonder why I ever went down this path...
When I finished the swap of my 400 with the new 440, the new engine created a really strong vibration. I attributed it to 1) my drive shaft needing to be balanced and 2) new really hard engine mounts. I used the some of the new poly mounts that are now out.
Well, the guys as the mopar shop where my car has been getting the new rearend bolted together say that the vibration is still really bad, even after getting the drive shaft balanced and installed.
They believe that the motor / trans were put together with the wrong type of balancing. They believe that when the transmission was put on the engine, that a non-externally balanced flywheel was used, when they should have used an externally balanced one should have been.
They also said something about the harmonic balancer on the front. I'm probably not restating what they said exactly right, because I was seeing red when they were telling me this (mostly because I was getting frustrated with them and these problems in general by this time)
The engine is a 1973 440 block. I've been trying to research here on the forums, and this is what I think I know so far (please correct me if wrong!) -- OK, so the 1973 should have a cast crank, and cast cranks are externally balanced. So the front harmonic balancer should be for an "externally balanced cast crank" and the flywheel should be for an "externally balanced cast crank"
Is there anyway for me to check that all of these are correct or not correct? How do I make sure I have a cast crank, the right front balancer, and the right flywheel? Can I check the flywheel without dropping the transmission, like by removing the inspection plate?
Its hard for me to believe that the engine / trans have been put together wrong all this time. The car it came from was a daily driver for the guy I bought it from -- but I can't say for sure that the it didn't have the same problem in the other car because we didn't drive it enough before pulling the engine.
Also, could this all just be a red herring, and the vibration is just caused by the stiffer engine mounts?
Thanks guys -- This forum has been a huge help. (BTW, as I was talking to the shop guy, the only thoughts going through my head was that I had to come back and ask here before I did anything)