I have a 68 'vert with a 454. It has about 550 ft-lbs of torque. I bought a high torque starter and couldn't adjust it so I sent it back. Then I bought a regular GM starter from the local parts store. It worked fine but sounded a bit bad. I shimmed it and it worked great. I left for Korea for a year and left my wife instructions to start the car every couple of weeks. I came back 10 months later and she hadn't started it in 9 1/2 months. She said the starter sounded weird and it wouldn't turn over. I went out and sure enough it was grinding on the flywheel and was completely out of whack. (I primed the motor first and blew out the fuel lines and rebuilt the carb before trying to start it) Anyway, I re-shimmed the starter and it worked great again for about 2-3 starts and then started grinding again. Still starts, but sounds terrible. I made sure the bolts were tightened, etc. Any ideas how to keep it from doing this? As much as I love working on the car...this is getting a bit ridiculous! Appreciate any ideas.