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

hotcam kit! New timing?

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Old 04-25-2008, 12:30 AM
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hotcam kit! New timing?

Im getting a hotcam kit and im wondering... Do i need to get a whole new factory timing set or just the timing chain? The car is a '94 Z so it does not have the vented opti and it has 33k mi. on it all original. Thanks
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Old 04-25-2008, 02:02 AM
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Get the whole high performance timing chain set from gmpp. That's what I did when I put in my hotcam. If you're gonna tear it down, do the whole thing don't half a-- it. JMHO.
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Old 04-25-2008, 03:54 AM
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Originally Posted by Future_Z_Owner
Im getting a hotcam kit and im wondering... Do i need to get a whole new factory timing set or just the timing chain? The car is a '94 Z so it does not have the vented opti and it has 33k mi. on it all original. Thanks
I replaced mine too, with the cam change. Only had 28k on it, but what the heck. I used the stock replacement gears and chain. Replace all of it or none, don't mix and match.
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Old 04-25-2008, 06:45 AM
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I would throw in a new factory timing set for insurance. Keep the other as a spare.
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Old 04-25-2008, 07:04 AM
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At 33K you shouldn't need one, but your are there and have to take off the chain anyway - a new wouldn't hurt.

FYI - the GMPP chain kit is noisier than the stock - just so you know.
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Old 04-25-2008, 09:59 AM
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Mine looked just fine even at 90K, but I changed it anyway because of the mileage, and "I was already there".

Do what you want, but I think at 33k your set will be just fine if you don't. I probably wouldn't change it.
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Old 04-25-2008, 11:14 AM
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If my memory serves me correctly, if you do the LT4 chain that i think they are talking about you have to convert to the newer timing cover and vented style opti with the cam witht he longer dowel pin. I could be wrong.
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Old 04-25-2008, 11:26 AM
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^im pretty sure thats correct. the LT4 chain can only be used on the vented style opti's. a stock replacement should be fine
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Old 04-25-2008, 12:12 PM
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They are right, if you want to upgrade the timing set, you'll also need to convert the timing cover, etc. When I did mine around 80K miles, everything looked good, but I still put a new set, gears and chain. Do not replace the chain or gears only. Its cheap insurance and now is the time to do it since your there already.

Aaron
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Old 04-25-2008, 02:02 PM
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Yeah im not upgrading my opti or any of that. Thats why i was sure to post that it was a non vented. Thanks for the help guys ima go find the p/n for the factory timing set. Not just the chain... Sucks cause the chain is only like $30 Better safe than sorry though
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Old 04-25-2008, 02:51 PM
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'93 - '97 Timing chain: 10128485
'93 - '97 Crank Sprocket: 10128346
'93 - '94 Cam Sprocket: 10128349
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Old 04-25-2008, 03:07 PM
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Originally Posted by Compstall
'93 - '97 Timing chain: 10128485
'93 - '97 Crank Sprocket: 10128346
'93 - '94 Cam Sprocket: 10128349
Right on man thanks!
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