SFI flywheel
Thread Starter
Safety Car
Joined: Jan 2008
Posts: 3,795
Likes: 435
From: Aarhus, Denmark
Thread Starter
Safety Car
Joined: Jan 2008
Posts: 3,795
Likes: 435
From: Aarhus, Denmark
Difference = 0.369"
My old pivot ball is total 1.369" (1.25")
The pivot ball I've bought is total 1.78"
Difference = 0.411"
0.411 - 0.369 = 0.042" (1mm)
Safety Car
Joined: Feb 2006
Posts: 4,142
Likes: 704
Some info I found on the interweb.
The 3729000 ball stud ( at 1.5" overall length ) was used on all Corvettes from '55 to '81.
Except at the beginning of the '66 production they switched to the 3887159 ball stud, ( at 1.375" overall length ). It turned out this shorter ball stud could cause the clutch fork to hit the bellhousing. Later in '66 they changed back to the longer stud.
So, somehow, it appears that the shorter stud ended up in your bellhousing.
It looks like the longer stud you have on order will match up fine with your thinner flywheel.
The 3729000 ball stud ( at 1.5" overall length ) was used on all Corvettes from '55 to '81.
Except at the beginning of the '66 production they switched to the 3887159 ball stud, ( at 1.375" overall length ). It turned out this shorter ball stud could cause the clutch fork to hit the bellhousing. Later in '66 they changed back to the longer stud.
So, somehow, it appears that the shorter stud ended up in your bellhousing.
It looks like the longer stud you have on order will match up fine with your thinner flywheel.
Thread Starter
Safety Car
Joined: Jan 2008
Posts: 3,795
Likes: 435
From: Aarhus, Denmark
GM 3790556 Clutch Fork Ball Stud (1 3/4 Long) Or 1.750 - 1.369 =.381 =9.6774 mm
You only needed 7-8mm, but a couple of mm is not a big deal. It is just the pivot point for your clutch fork rod. I installed a 21 pound SFI steel 168 tooth flywheel in front of my tko 600 and with the short ball stud sent by keisler the clutch would not disengage. So I went down to the local chevy dealer and bought the longer one
You only needed 7-8mm, but a couple of mm is not a big deal. It is just the pivot point for your clutch fork rod. I installed a 21 pound SFI steel 168 tooth flywheel in front of my tko 600 and with the short ball stud sent by keisler the clutch would not disengage. So I went down to the local chevy dealer and bought the longer one
