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L67 Timing Chain

DeathSammich

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Will be changing the heads on my L67 very soon and was just wondering if it's worth changing the timing chain at the same time? The car has done about 260000kms. How long do these chains last? Will replacing it pick up some lost power? And is there a guide on here to do it? Cheers.
 

vr304

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I’d definitely change it at those k’s mate if your chain is worn it which it will be you will most likely regain some lost performance
 

immortality

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It wouldn't hurt. Just make sure you get an L67 timing chain set and not the standard ecotec one.
 

Calaber

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What sort of wear would there be on the crank and cam sprockets at that distance? I replaced a chain on a 253 years ago with very high mileage and the 2 sprockets were absolutely stuffed as well as the chain.
 

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For the cost and hassle I wouldn’t bother personally. They’re known to do over 500,000km and they’re a decent design and don’t take much of a load compared to most newer engines. It won’t make it go any better.

253’s came out with a single row chain, and when upgraded to a double row chain they were much stronger and more reliable. Single chain was a known issue with those ones. Much better tech in an ecotec compared to a 253/304/308.
 

immortality

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At the very least I would change the tensioner but for the cost of a timing chain set it wouldn't hurt. It also depends on what done with the valve train. Stock springs, stock chain should be ok. If you have fitted better springs than a new chain is worth the extra coin spent.
 

EYY

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Yeah I mean if you were in there for another reason it’s probably worth doing, but he’s changing heads and it’s a fair bit more work to remove the timing cover and extra cost of gaskets etc too. Spose if time and funds allow if may be worthwhile
 

Calaber

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For the cost and hassle I wouldn’t bother personally. They’re known to do over 500,000km and they’re a decent design and don’t take much of a load compared to most newer engines. It won’t make it go any better.

253’s came out with a single row chain, and when upgraded to a double row chain they were much stronger and more reliable. Single chain was a known issue with those ones. Much better tech in an ecotec compared to a 253/304/308.
The 253 and 308 originally had a double row, but by the HZ, it had been downgraded to a single, yet the double row sprockets were still fitted. Mine was a single row but I fitted a new double row leaving the old sprockets in place. It shut up the chain rattle and I was selling the car anyway but the wear on the front row of each sprocket was incredible.
 
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