vivivivivibration

nm9stheham have been watching all of your replies on helping to diagnose what is going on here, all good stuff ! There is a picture of his new TRW L2316 piston tops on page #38 you are asking about.

We have pretty much gone through all the crankshaft/balance possibilities for now. Going over the engine build with him to see if we can come up with something out of whack. Looks like a good simple stock 71 340 engine build, cast J heads, 340 cam. So far so good looks like he is doing a good job and properly so far. We are going back to square one and have him do a compression test like you were saying and start working back out from there to see if we can help him get it to run smoother. Thank You

50 year old car build here, it's got one solid engine mount on the driver's side, the other is rubber and any little miss in the engine could send that up through the frame and body to exaggerate it.

Will keep digging as we get time . . .