opinions on spec stage 1?

Some chatter can be due to a flywheel that was not surfaced properly or not at all or is possibly damaged. The t/o bearing squeel has been eliminated as SPEC now uses a fiber Timken bearing. Just make sure you follow the break-in procedure very closely.
 
so all new spec stage 1 clutches have the fiber timken bearing for the t/o? If not, i would buy a separate centerforce t/o bearing, but if the one in the kit is fine then i wont have any problems i suppose. I am going to have my flywheel ground flat by my machine shop during engine build. So that wont be a problem...
 
Yes, the new ones come with the Timken bearing unless otherwise specified by the customer. What SPEC used at one time as their standard was a very good quality BCA/Federal-Mogul bearing that I beleive was/is used as Ford's OEM supplier. Anyway, the Timken has produced better results.
 
I think SPEC makes about the best clutch you are going to find for the money. Ive tried about 5 different brands and the SPEC has by far lasted the longest.
 
I have a spec stage 1 - just completing the break in period. I also installed a new stainless steel flywheel. I had a slight amount of chatter on the first day and that was about it. It grabs like a mofo like others have described. You need to match revs for it to be smooth, otherwise it will grab and jerk you around. I think that it typical of any performance clutch.
I called to check on the Timken bearing, as you may read about others trashing the "plastic" t/o bearing. I spoke to the spec guys and they confirmed it was a Timken bearing that they have been using for about a year with good results. Just to verify I went into a parts store and looked at a Timken bearing and sure enough it is the exact same (about $35). They will swap it out for an all steel bearing if you prefer. I would stick with the TImken though, as it appears to have the best reputation.

The price seems fair.

Howard