LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Installing Cam Package.. Questions

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Old Jul 26, 2008 | 10:20 AM
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Installing Cam Package.. Questions

I'm looking at shoebox's instructions and it says to turn the crankshaft until the arrow on the balencer is pointing up at 12 o'clock. When I did my opti i put it on without paying attention to where the arrow was pointing before so it could be off now. Is this gonna be a problem with the install?
Old Jul 26, 2008 | 10:27 AM
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also, do i need new lifters or will the stock ones do the job?
Old Jul 26, 2008 | 10:35 AM
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As long as you line up the shaft and the opti slid on nice and flush. And the lifters should be fine as long as they werent ticking or anything.
Old Jul 26, 2008 | 10:37 AM
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But isn't the arrow on the balencer that will indicate TDC? And that could have gone on 3 different ways. Im saying since I didn't pay attention to what way it was put on, then it could be telling me something different and I could mess up my timing, no?
Old Jul 26, 2008 | 12:15 PM
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anyone? im doing it today and don't wanna go any further before i know.
Old Jul 26, 2008 | 12:26 PM
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Originally Posted by Mtxz453
But isn't the arrow on the balencer that will indicate TDC? And that could have gone on 3 different ways. Im saying since I didn't pay attention to what way it was put on, then it could be telling me something different and I could mess up my timing, no?
The damper will only bolt on the hub one way. The three arms on the hub are not evenly spaced. The bolt holes only line up in one position. But the hub is not keyed to the crank, so there is no guarantee the arrow is properly oriented anyway.

When installing the Opti, it does not make any difference how the cam sprocket is oriented. As long as the "missing tooth" on the splined drive shaft (93-94 unvented) is aligned with the matching slot on the cam sprocket, the Opti is installed correctly. The damper/arrow is irrelevant to installing the Opti.

Courtesy of Shoebox:

http://shbox.com/1/93-94_opti.jpg
Old Jul 26, 2008 | 01:15 PM
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i understand that, but i thought on shoebox's installation page it says when the arrow on the damper is pointed at 12 o'clock, #6 is at TDC and the cam gear should be at 3 o'clock, this way timing will stay the same once the new cam is in and i put the new timing set on. Am i misreading something, im a little confused at this point?
Old Jul 26, 2008 | 02:36 PM
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The arrow is just for reference. It does not affect timing. If you want to use it in the future for reference then put 1 or 6 at tdc and install it up. But there are no guarantees it will stay there unless you get a keyed hub.
Old Jul 26, 2008 | 03:29 PM
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If the dots on the timing gears are aligned correctly, it doesn't matter where the arrow on the dampner is pointing. The dampner on an LTx engine has nothing to do with setting the timing.
Old Jul 27, 2008 | 11:14 AM
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Originally Posted by Mtxz453
But isn't the arrow on the balencer that will indicate TDC? And that could have gone on 3 different ways. Im saying since I didn't pay attention to what way it was put on, then it could be telling me something different and I could mess up my timing, no?
Originally Posted by Injuneer
The damper will only bolt on the hub one way. The three arms on the hub are not evenly spaced. The bolt holes only line up in one position. But the hub is not keyed to the crank, so there is no guarantee the arrow is properly oriented anyway.

When installing the Opti, it does not make any difference how the cam sprocket is oriented. As long as the "missing tooth" on the splined drive shaft (93-94 unvented) is aligned with the matching slot on the cam sprocket, the Opti is installed correctly. The damper/arrow is irrelevant to installing the Opti.

Courtesy of Shoebox:

http://shbox.com/1/93-94_opti.jpg
Originally Posted by Mtxz453
i understand that, but i thought on shoebox's installation page it says when the arrow on the damper is pointed at 12 o'clock, #6 is at TDC and the cam gear should be at 3 o'clock, this way timing will stay the same once the new cam is in and i put the new timing set on. Am i misreading something, im a little confused at this point?
You've certainly got me confused. You appeared to feel the damper could have been put on the hub three different ways, and I explained that you couldn't put it on three different ways, only one way. And that since the hub is not keyed, you can't rely on the position of the aroow to indicate anything. But you indicate you already know that

If you already knew that, what is your question?
Old Jul 29, 2008 | 08:48 AM
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stock lifters will be just fine, just make give them an eyeball check and soak them in oil before reinstalling

I had an extra set availible but i just reused my stock 90k mile lifters.
Old Jul 29, 2008 | 10:05 AM
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the arrow could be used as a reference which i believe is what shoebox was describing in his write up. but there is no gaurantee on that. so either way you would have to verify TDC with the timing cover off. like someone else said you could set it up in the future so that the arrow is a true reference but still never a gaurantee for the future because the crank is not keyed.
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