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Old 01-10-2005, 23:22   #1 (permalink)
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confused 289 with BigBlock TopLoader


Hi

I have a setup of the following:
67 fastback (formerly an automatic),
289 engine,
deep pilot bushing, about 7/8",
bigblock toploader (RUG-AE2) with short snout large diameter input shaft,
custom clutch plate 10.5 in with large input,
custom clutch cover with long levers (I think, though this seems wrong, but I recall
the clutch maker saying this to me when we were discussing this build),
large throw-out bearing (obviously),
and a custom fork that I had made by taking a big block fork (galaxie , I think)
and having a length of material cut from its center section and the ends rewelded
to be the length of the stock 289 small block fork and also with its dog-leg subsequently
removed, so that it resembles the small block fork but with big block ends,
also I have the bigblock threaded half-ball to push the fork,
and that ball (on its threaded rod) is all actuated by the stock 67 4sp clutch pedal
/ equalizer setup.

My problem here is that something is not right.
I know this can work since a long lost buddy of mine had a 65 fastback with 289 and bigblock toploader and manual clutch.

I have two problems with this setup:

1)
I have a vibration, which I am pretty sure is caused by the short snout since I
have seen (orbital) wear on the edges of a previous stock type (1/2") pilot
bushing.
Getting a long snout large diameter input shaft from TopLoader heaven should fix
this. Or even using the small diameter long snout shaft with all the stock parts elsewhere.

But even if the vibration is not because of the short snout, the long snout (with the stock 1/2" pilot bushing ) is the correct part, right?

2)
The cluch pedal has zero play at > 3000 rpm or so.
Meanning, when the centrifugal weights on the clutch-cover levers start to do their
thing and tighten the clutch, they force the throw-out bearing against the fork
and the fork forces all the play out of the pedal sytem.
This is not good.

So the big question is,

"Does anyone know the correct setup of parts, and customization, and lever ratios of the fork to make this setup work?"

Surely somebody out there has done this as well.
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Old 01-11-2005, 22:45   #2 (permalink)
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Re: 289 with BigBlock TopLoader

Quote:
Originally Posted by BobStangman

Hi

I have a setup of the following:
67 fastback (formerly an automatic),
289 engine,
deep pilot bushing, about 7/8",
bigblock toploader (RUG-AE2) with short snout large diameter input shaft,
custom clutch plate 10.5 in with large input,
custom clutch cover with long levers (I think, though this seems wrong, but I recall
the clutch maker saying this to me when we were discussing this build),
large throw-out bearing (obviously),
and a custom fork that I had made by taking a big block fork (galaxie , I think)
and having a length of material cut from its center section and the ends rewelded
to be the length of the stock 289 small block fork and also with its dog-leg subsequently
removed, so that it resembles the small block fork but with big block ends,
also I have the bigblock threaded half-ball to push the fork,
and that ball (on its threaded rod) is all actuated by the stock 67 4sp clutch pedal
/ equalizer setup.

My problem here is that something is not right.
I know this can work since a long lost buddy of mine had a 65 fastback with 289 and bigblock toploader and manual clutch.

I have two problems with this setup:

1)
I have a vibration, which I am pretty sure is caused by the short snout since I
have seen (orbital) wear on the edges of a previous stock type (1/2") pilot
bushing.
Getting a long snout large diameter input shaft from TopLoader heaven should fix
this. Or even using the small diameter long snout shaft with all the stock parts elsewhere.

But even if the vibration is not because of the short snout, the long snout (with the stock 1/2" pilot bushing ) is the correct part, right?

2)
The cluch pedal has zero play at > 3000 rpm or so.
Meanning, when the centrifugal weights on the clutch-cover levers start to do their
thing and tighten the clutch, they force the throw-out bearing against the fork
and the fork forces all the play out of the pedal sytem.
This is not good.

So the big question is,

"Does anyone know the correct setup of parts, and customization, and lever ratios of the fork to make this setup work?"

Surely somebody out there has done this as well.
sorry bro i have answer for you, im more in to the resoration part of these ol beast. good luck though.
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Old 02-08-2005, 05:20   #3 (permalink)
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Re: 289 with BigBlock TopLoader

I seem to recall hearing/reading about someone having problems with a big block box went to hydrolic clutch to fix it sorry I can't be of any more help
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Old 02-08-2005, 12:46   #4 (permalink)
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Re: 289 with BigBlock TopLoader

u got the right spicket bush in the crank? also a hyd set up is easy to do
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Old 02-09-2005, 23:02   #5 (permalink)
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Re: 289 with BigBlock TopLoader

I'm currently doing the same thing (although with a pro-shifted toaploader = liberty gears) and I have yet to come up with a solution for the clutch arangement. The stock flywheel if this is what you have, all small blocks (mine is 351C,v but same for 289) have 5/16" holes in the flywheel, while the corect replacement pressure plate is drilled for the big block's 3/8" flywheel holes. It's the same pattern, that's why it all bolts up. The difference (slop) is bad ie: creates bad vibrations, especially at high speeds. What I'm doing is having some special 5/16" bolts made with a 3/8" sholder. Have seen this done before (with a low 11's 300" I6 actually). We'll see how it works out, maybe this is your problem? ?? Or do you have an aftermarket flywheel? As far as the clutch'pressure plate, you didn't mention what you had, but a long style clutch is design to increase holding capacity with RPM.

Hope this helps,
PS: all with stock Z-bar and such.

Keep us posted with your results, I'm curious.

Trevor
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Old 02-13-2005, 18:03   #6 (permalink)
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Re: 289 with BigBlock TopLoader

Its never a successful swap. The extended pilot bush just defeats the purpose of the upgraded input shat anyway... And that is were the vibraton comes from...
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