I recently installed a 383 stroker motor in my 68 camaro. This is hooked up to a t56 six speed. I have noticed that when shifting at higher rpm's - above 6,000 - that my clutch sticks on the floor and I hit my rev limiter. This does not happen when shifting at lower rpm's. The clutch is the old style with z-bar linkage and I did not have this problem when it was hooked up to the previous 350 horse 350 ci engine. The 383 has a lot more power and I think that maybe the linkage is binding up but I am not sure. Has anyone else ever had this type of problem and how was it solved?

Sounds like you have a diaphragm clutch that is being pushed down too far. You can adjust the clutch so it releases only when you push it almost all the way down. That should keep it from sticking to the floor.

If you are running a late model hydraulic factory GM clutch master/slave set up-AND SPEED SHIFTING-you need to know that GM engineered a restriction inside the line that is supposed to prevent or softener up the shift. You can remove the line where it attaches to the slave and check for the restriction there using a .125" drill bit (1/8"?).

If you find the restriction, you simply need to drill past it being careful not to damage the inside of the line. There was an article in one of the car magazines about this.

Go over to www.corvetteforum.com (http://www.corvetteforum.com) and do a search there as it has been discussed over there at length.

I am confident that this may be part of your problem.

The t56 that I have is from Sallee chevrolet and it is a retro fit transmission with an adapter plate to hook to old style bellhousing. I am using the original mechanical clutch linkage. Jon was right in the fact that the clutch is a Hays diaphram type clutch. I haven't had time to adjust the pedal so it releases closer to the floor yet, but will check it out this weekend.

A Centerforce diaphragm was designed specifically to eliminate this problem. They use a ring of weights around the throwout fingers that do two things:
1) keep the diphragm from going "over center" and locking open at high RPM
2) The weights apply some extra clamping force at high RPM when the clutch is engaged

I've been using these for years and haven't ever had a clutch lock open at max RPM.

Paul D