#21  
Old 07-15-2021, 12:39 PM
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HWYSTR455 HWYSTR455 is offline
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You can just polish the retainer with some 600/800 paper, it should be fine.


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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
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  #22  
Old 07-17-2021, 12:53 AM
wbnapier wbnapier is offline
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Update.

The clutch forks should be hardened steel. The repop clutch fork I used was not.

A stock or common aftermarket pressure plate requires 300 lbs. to move the pressure plate diaphragm. My Center-Force requires 350-375, so more stress on the unhardened clutch fork.

I should receive my OEM clutch fork on Monday, and I purchased a new pressure plate and clutch from the specialty clutch shop, which I installed today.

I am happy to have discovered this shop, they assemble / rebuild clutches, pressure plates, grind flywheels, and have all sorts of tools and machines for testing and servicing these things. The staff is very knowledgeable about all things clutch related.

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1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
  #23  
Old 07-17-2021, 09:50 AM
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Hm. So they are saying it was because the fork wasn't hardened? Not sure I buy that, or it would have bent on both sides.

Guess we will find out after some use.


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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be
  #24  
Old 07-17-2021, 10:15 AM
wbnapier wbnapier is offline
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Yeah, that is a working theory, and it is loosely supported by facts, but who knows for sure. Facts:

1) There was no damage on any other component other than the tranny front bearing retainer.
2) The clutch fork steel is not hardened. It should be.
3) My pressure plate diaphragm does require 15-25% more pressure to actuate, thus putting more stress on the clutch fork. We tested it on the machine.

Other tid bits of info from the clutch. The flat head pivot ball, that I didn't like as it doesn't cleanly fit the round recess in the clutch fork, they said it is that way for a reason. It traps / retains a nugget of grease. If they were a round, mated pair, it would push out the grease.

They don't like Center-Force. The PP weights are a gimmick that only work at really high RPMs (6k+). They had other comments as well.

They assemble most clutches from blanks there based on ones car and goals.

__________________
1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
  #25  
Old 07-17-2021, 11:23 AM
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Quote:
Originally Posted by wbnapier View Post
...

They don't like Center-Force. The PP weights are a gimmick that only work at really high RPMs (6k+). They had other comments as well.
.
Been saying that since day one, the weights actually can fail or hang, and cause more issues than they supposedly help. I think Centerforce stuff is junk, but I will say 'that's my opinion'.


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__________________
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be
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