Need the part # for the above. I am swapping a LT4 shortblock into my car and the Harmonic Balance is different from the LT1.

Thanks
Mike

 

12551486. You also need the correct hub, pn 12550097.

Why not upgrade to an ATI or Fluidampr?

Rich Krause

 

Well, will it interchange? Where and how much is the ATI or Fluidampr? This will work for the LT4 shortblock?


-Mike

 

Another quick question, is the LT1 and LT4 actual balancer the same item... except for the hub? I am thinking all I need is the hub if the balance is actually the same.

Mike

 

No! Here is what I believe to know:

93-95 F body hub #12553250
96-97 F body hub #12550097
Above #s regardless of damper used
#12550097 .090" shorter to allow for CPS installation

LT4 2nd gen. damper #12551486
LT1 2nd gen. damper #10128489
The #s above will not be the same as oem 1st. gen. components
More $$ as well, so check on oem #s if desired.

oem LT1 Y body damper is 2.08" thick
oem LT1 B/F body damper is 1.34" thick
The extra thickness (from thicker damper section) results in belt placement moved forward .74"

(I believe) LT4 damper (which is a Y body component,....there was no oem LT4 F body) specs will coincide with above Y body LT1 specs
Not clear how 2nd gen LT1 damper (above) specs will compare to oem F/B body LT1 damper.

 

So can I use my LT1 balance "95" and throw the LT4 hub onto it? The block I am putting this on is a 96 lt4 block, and i dont want to have the buy the lt4 balance.. just the hub.


thanks
mike

 

I'd like to know the diff between the Gen I LT1 damper and the Gen II LT1 damper is (for the F body).

Is one supposed to be better than the other?? I would assume that the second gen one would be a better design, but that isn't always the case.

I have a couple of them, and they are different. The only thing I could tell with a quick visual examination is that the web material inside the balancer seems to be offset a tiny little more on one than the other and the pulley seems to be just a tiny bit different. There seems to be different holes drilled along the edge of it too. (I don't have it in fromnt of me at the moment.) Not anywhere near the differences betweent the LT1 and LT4 pulley though.

If the part # for the Gen II LT1 F body is10128489, then what is the part # for the Gen I one?

When was the second Gen Fbody damper introduced?

Was there a B body specific damper too?

 

Are you keeping the CPS? If you are you will need at least need the hub from an OBD II engine so that it will clear the reluctor.

 

How the hell can I get anything done, when I'd rather post on the forum?

OK, didn't realize my post was that confusing. Can you use the '95 (LT1) oem balancer? Not if you want the correct balancer (LT4) on your LT4 engine. To my knowledge, no such thing as an LT4 hub. No such thing as an LT4 block, but regardless, block is not an issue/factor in this.

dont want to have the buy the lt4 balance.. just the hub

The choice is yours. Wanna LT4 damper for your LT4?

EDIT: BTW, and forgot to add, because the LT4/F body was not an oem assembly line combo, don't expect the conversion to go as smooth as it should first appear. SLP sorta 'jerry rigged' (by design?) the related combo components in the process of making it a 'turn key' product. You won't find, in oem parts book, specific part #s necessary to make an LT4 engine, F body compatible. Dislike discouraging ya, but available 'Y' body components were 'reassembled' in the conversion process. This according to actual LT4/F bod owner scrutinization of SLP conversion.

 

OK, I 'm confused. You have a 'couple of them', and you are asking someone else? Or are you teasing. If not, on or off list, I'd really like to know myself. Pleeeese more info.

The only thing I could tell with a quick visual examination is that the web material inside the balancer seems to be offset a tiny little more on one than the other and the pulley seems to be just a tiny bit different.

???

There seems to be different holes drilled along the edge of it too.

OK, those would be holes to balance the damper. That wouldn't be usual.

If the part # for the Gen II LT1 F body is 10128489, then what is the part # for the Gen I one?

#12551138....(93-97 F body) for the oem component.

Was there a B body specific damper too?

As I alluded to, in previous post, it is the same as F body. Again, #12551138 (94-96 B body)

 

Rich they just aren' hearing you, if you want something better than stock get an ATI.

You can get an ATI at thunderracing for 399 and it comes with a KEYED HUB. Very nice piece, I have one.

 

Yes there is a lt4 hub and a lt1 hub. The more i keep talking about this the more i get confused! i am transferring my balance from my 95lt1 to the lt4 block, i just want to make sure the lt4 "hub" will fit my lt1 "95 model" balance. the hole size was different from the lt1 model so the lt4 hub i am hoping will fit onto the lt2 balance.. ok enough.. im confuseddddd


mike

 

I should have been more specific. I have two balancers, one that I know is an F body damper, and another one which isn't different enough to be a Y body damper (.74 belt offset from F body balancer), so I am pretty sure that is also an F body balancer... just a little bit different.

I haven't taken the time yet to take any measurements on them, just a visual comparison. That's why I was asking what the difference was exactly. I was hoping somebody here could tell me what the differences are, and why.

BTW,One other thing I noticed between the two when I looked at them is that one of them has an arrow cast into it like this picture http://shbox.com/1/pull_pulley.jpg

While the other one does not have the arrow.

I'll guess I'll go take some measurements and see what I come up with.

Quote:

Originally posted by arnie

#12551138....(93-97 F body) for the oem component.

What was the purpose of the Gen II balancer if it wasn't used as an OEM component from 93-97? A redesign just for replacement and warranty purposes?

EDIT: Found this on Shoebox's site.
Now I'm a little confused.

 

I've got a very old website listing that compares the LT4 to the LT1. It shows the OEM part #'s for the Corvette LT1 and LT4 that Arnie quoted for the "2nd Gen" versions, so it would appear that the "2nd Gen" thing is just a running change that was made around 1996.

 

Would you think that the two are interchangeable? (The gen I style and the Gen II style.)