Extreme duty timing chain
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Burning Brakes
Joined: Sep 2003
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From: Miami FL
Extreme duty timing chain
Has anyone had problems with the "extreme duty timing chain"? I had one istalled when I did my LT1/LT4 conversion and after sending my Vette to the shop to correct an oil leak (from the timing cover/oil pan area) the mechanic pulled the timing geat out and it showed quie a bit of wear. It had less that 8k miles on it. It is also quite a bit heavier that the stock unit. The mechanic recommended to install an LT4 timing gear and chain set up. 
Race Director
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From: Texas
No issues to date with mine. It's heavier so it holds up better 
GM sells the chain for extreme duty [read "racing"] use (and the box even says "for off road use only" since there was really no reason to certify it for emissions)
GM sells the chain for extreme duty [read "racing"] use (and the box even says "for off road use only" since there was really no reason to certify it for emissions)
Last edited by 96GS#007; Aug 20, 2004 at 07:37 PM.
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Your mechanic needs to figure out what has caused this excessive wear. The stock LT4 set-up won't solve the problem. Also properly assembled, you should not have had a leak this soon. The best set-up, after your problems are corrected would be a Meziere conversion so you can run a true double roller.
Thread Starter
Burning Brakes
Joined: Sep 2003
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From: Miami FL
Originally Posted by Corvette Kid NC
Your mechanic needs to figure out what has caused this excessive wear. The stock LT4 set-up won't solve the problem. Also properly assembled, you should not have had a leak this soon. The best set-up, after your problems are corrected would be a Meziere conversion so you can run a true double roller.
I'm seriously looking at the Mez. electric water pump option ( are they expensive?) Does anyone know it the extreme duty timing gear set has the part #'s stamped on them? I noticed the OEM did and the EX duty had some number engraved.
Thread Starter
Burning Brakes
Joined: Sep 2003
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From: Miami FL
Originally Posted by 96GS#007
No issues to date with mine. It's heavier so it holds up better
GM sells the chain for extreme duty [read "racing"] use (and the box even says "for off road use only" since there was really no reason to certify it for emissions)
GM sells the chain for extreme duty [read "racing"] use (and the box even says "for off road use only" since there was really no reason to certify it for emissions)
I had no "issues" with mine. I mean it wasn't making strange noises and tha car ran fine. He just noticed the wear when he had it out to fix the DAMN OIL LEAK!!!! oh, sorry guys
Last edited by TOO_HOTTVETTE; Aug 20, 2004 at 08:11 PM.
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Originally Posted by TOO_HOTTVETTE
Well, heavier does not always mean stronger or better. Some parts can be treated (like the cryo freezing) to make them stronger. Ummm lead is pretty damn heavy compared to steel, but....
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by TOO_HOTTVETTE
I'm seriously looking at the Mez. electric water pump option ( are they expensive?) Does anyone know it the extreme duty timing gear set has the part #'s stamped on them? I noticed the OEM did and the EX duty had some number engraved.
Thread Starter
Burning Brakes
Joined: Sep 2003
Posts: 1,214
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From: Miami FL
Originally Posted by Corvette Kid NC
You can do the conversion for little more than an extreme duty set will cost, here's why. You can get the heavy duty Meziere pump for a little over $200 which allows you to use a conventional timing set, Cloyes true double roller, about $75. Let me know if you want and I'll get you part#s and where to buy.
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Large Impressive Member
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Posts: 65,811
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Pump WP118HD
Timing set 9-3145
Jegs or Summit should have a good price on the timing set, I emailed you with more info.
Timing set 9-3145
Jegs or Summit should have a good price on the timing set, I emailed you with more info.
Last edited by Corvette Kid; Aug 21, 2004 at 07:09 PM.