1992 Miata, LS1, then LS3 swapped

[GySgtFrank]

Originally Posted by mazpower

It started making a weird thumping sound in Louisiana...about 1800 miles into the trip. I thought it was the tranny but a friend suggested I replace the throwout bearing. So we did that outside the cabin when we got there and the noise persisted. Found out last weekend that it was because 5 of the 6 flywheel bolts came loose. I followed ARP's torque specs, so much for that. I used red loctite this time, hopefully they don't come loose again.

I was crewing for a stock car running a chevy 250 straight 6 a number of years ago. Had the same problem. No matter what we did it would spit off flywheels, even the LocTite didn't help. It turned out it was some sort of weird harmonic that kept loosening the bolts. We put a Fluidampr front vibration dampener on it and it cured the problem.