621 Bellhousing clutch fork question

I'm running an early 621 bell on my 283 with a Wilwood slave. 11 in clutch, short throw out bearing etc. I picked up my current clutch fork with the slave as they recommended it. But with the throwout bearing resting against the pressure plate the fork nearly hits the opening in the bell, hardly any room to actuate the clutch. So, what fork was used with the 621 bellhousing? And is that what I'm needing?

 

A taller t/o bearing would move the outer end of the fork farther forward for more travel, easy to get one and check it out. You may need a fork like this, but the slave might not fit the same.


http://www.ss396.com/mm5/merchant.m...Product_Code=FEH-397&Category_Code=CLUTCHFORK

 

Thanx, I've got a long bearing showing up this morning so I'll give that a look. My brother in law has the original fork as pictured above. I want to see how it compaires to the fork I have. They are substantially different looks wise. It's probly where I should start though, as GM designed it, then fiddle with the T/O bearing if needed.

 

The bearing needs to match the pressure plate. Short bearing with a 3 finger or bent diaphram, long bearing with a flat diaphram clutch.

What pressure plate do you have? post a pic if you're not sure

 

Bent diaphram, Zoom kit from Summit # ZZZ-MU1877-1B. The fork I have is 15592270, I believe a GM #?

Correct stud ball, 4.75 in from engine block, correct?

 

Went thru this 12 years ago only w a 3-finger B&B pressure plate.. There are 2 pivot ball lengths & 3 throwout bearing lengths, also either square-edged or round edge TO bearings, took many calls & exchange of parts to get the right setup , hang in there , the parts are available, just alot of trail & error..

dave

 

Might try a fork that was used with that bellhousing?

http://paceperformance.com/i-513386...ith-hydraulic-clutch-linkage-all-engines.html

is what you have.

 

Yup, that's the fork I've got. I have the correct original on the way, should have it tomorrow and start from square one. Way to many options since the good ol days.

One more question that I'm going to post on the main board. How much space is needed between the end of the trans bearing retainer and the clutch disc hub? My setup looks to be tight, 3/16". Is that enough to release the clutch?

 

That should be plenty. The clutch disk should move back very little when it's released, probably 1/16" at the most

 

Thanks for all the help. I'd second guess all day long and then some otherwise.