1966 Corvette L72 Light Refresh

[napa68]

While waiting for a couple of new acquisitions to get delivered, I had some time to chase an item of concern on the 66. The engine had a detectable vibration above 4000 rpm. Not bad, but know it could be better. Historically, this car did have at least one clutch installed. I've had clutch / flywheel combinations that were out of balance exhibit this same trait, so I pulled the trans and clutch this week. My clutch of choice in recent years has been the McLeod Street Level Kit. They just do not chatter. I send the flywheel out to be machined and have pressure plate to be balanced together. The flywheel is the original dated unit, and had never been machined before. 2 days later, I got everything back and was pleased to find some drill marks to balance the flywheel, albeit not very much




While waiting for the balancing act, I got all the fasteners and parts cleaned up for reassembly. This particular pressure plate required some weight. Sometimes they are neutral, others require some drilling along the flange to lighten it up. I could probably say that is just the current state of quality today.





I may show some bias here, but I think the 64-67 Corvette shifter is one of the best, OE or aftermarket. When these shifters are right, they just plain work. I cleaned all of the old grease out of the shifter, regreased it, and mocked it up on the trans. The OE Corvette shifter starting in 65 has and adjustment for a shorter throw. So, I adjusted everything on the bench.



I use a complete input shaft, as it gives me a bit more leverage when sneaking up in the pressure plate torque. I am of the opinion it can get a better feel for the disc alignment. The trans just drops in when I do that.



My vibration is GREATLY diminished. Next, address the cooling system. The temp just continues to creep up to about 230 degrees now that we have summer temps. The radiator will need some love, so that is next on the docket.