1999 Vortec 350

[Big T]

2.5K reactions · 283 comments | Timing Chain Slack is a Power Killer | Dave's Auto Center

Timing Chain Slack is a Power Killer.

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[Will L.]

Yup. And if you guys paid attention to builds where guys share the information (n8in8or comes to mind) and anyone wanting any performance advances cam and ignition timing.

How his video showed slack at 90,000 miles- that is how much slack is in a 6.5 chain by 40,000 miles. High compression is what kills timing chains.
Gas engines at 8.5:1 and no turbo ran single roller chain. Go up to 10.5:1 and no builder wouldn’t jump to a double roller chain. How bad do you think it is at 21.5:1 (21.2 if gep).
Now- adding a turbo does it even more.
Many years ago on a different site a guy did the math and stock the chain should be Three double rollers if you never alter the boost or fueling.
In steps DSG making the gear drive system. When 6.2/6.5 sales deipp down, they stopped so Leroy started making them and went to the very fitting name “time keeper”.

Even for those who don’t want to advance timing- just maintaining it is big.

Ds4 automatically adjusts fpr a lot of stretch.
Db2 we notice it more. At minimum a guy should retime ip every 50,000 mile intervals but at 30,000 mile intervals it’s much more accurate.

 

[MrMarty51]

The gassers I used to run, new timing chain every 100,000 miles and new oil pump at 200,000 miles.
Made them old SBCs mighty happy.
I sold the 93 K1500 at just under 300,000 mikes and it still was running mighty sweeet.
Guy I sold it to got stupid, didnt soend money for a coolant pump, eventually overheated the engine to the total cease.
Over 350,000 miles when it died but it stll had not been using oil.

 

[THEFERMANATOR]

2.5K reactions · 283 comments | Timing Chain Slack is a Power Killer | Dave's Auto Center

Timing Chain Slack is a Power Killer.

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That's not that much, you should see how loose the Cloyes single roller performance chain sets are on these engines, not to mention how noisy they are. The thing with this style chain is they stretch a certain amount and that tends to be it. So long as you don't run thick oil in them they're pretty easy on the chains, but if you run thick oil, they'll stretch the chains right out from driving the oil pump.

 

[jrsavoie]

That's not that much, you should see how loose the Cloyes single roller performance chain sets are on these engines, not to mention how noisy they are. The thing with this style chain is they stretch a certain amount and that tends to be it. So long as you don't run thick oil in them they're pretty easy on the chains, but if you run thick oil, they'll stretch the chains right out from driving the oil pump.

They're real sloppy after 400,000 miles or so.