Timeing chain interchangable?

fpelchaiv · Nov 19, 2020

So im doing a freshen up on a 2000 4.3 that i am puting into my truck since the last one threw a rod. The old engine was a 98 i believe. I replaced the timing set as it was sloppy and the new one is still sloppy.
The timing gears and chain on my 98 look way beefier! And tighter. The 2000 4.3 timing gears are super thin and lightweight. Looks smaller than a bycicle chain. Could i take the beefier set up from the 98 and throw it on the 2000. The 98 set is way thicker. The chain is thicker. Just overall beefier. Everything looks to be the same proportions betrween the to.

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fpelchaiv · Nov 19, 2020

Any help would be appreciated! Im really wanting to use the beefier set if i can.

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Hoosier Rick · Nov 19, 2020

2000 has roller rockers Might be the reason for the lighter duty chain.

fpelchaiv · Nov 19, 2020

Here one pic

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fpelchaiv · Nov 19, 2020

Another

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manbearpig · Nov 19, 2020

Try putting it on there, see if it works. I put a beefier chain on my 3.1L.

fpelchaiv · Nov 19, 2020

Yea thats what im thinking. Was curious if anyone else had done the swap before. Time to pull the timing cover back off

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zerogravity58 · Nov 20, 2020

You sure that chain isn't a aftermarket chain? The one on the left looks like a cloyes timing chain.

fpelchaiv · Nov 20, 2020

It has GM stamped on the cam gear

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fpelchaiv · Nov 24, 2020

Update. Installed the gears, timing marks lined up. They were thicker, but crank sensor tone rig is still lined up. Have not fired it yet but i will update when i do

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fpelchaiv · Dec 24, 2020

Update ive been driving the truck and everything is working great

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Rebel n Dirt · Dec 24, 2020

fpelchaiv said:
Update ive been driving the truck and everything is working great

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Good to know. I would want the thicker one on my rig too. TY for the update.

oldeerslayer · Dec 25, 2020

Just looked at the application data on Rockauto and it seems in 99 GM switched to the bicycle chain to reduce valve train noise. Some of the better 99 up replacement sets include a tensioner to compensate for wear.
Glad to know the 92-98 set works on 99 up engines.
I'd think valve train noise isn't a problem on a cheap old pickup truck.
Besides who can hear it over the leaky muffler and the over sized tires howling.
Reliability is a more important issue.
It also appears that you can use the newer chain on the earlier engines but need to change covers. Which theoretically you replace every time anyway.

bent wrench · Dec 25, 2020

Isn't a roller chain lower mpg loss than a silent chain?

On SBC's we always used to convert to a roller chain.....

fpelchaiv · Dec 28, 2020

Yyou can't hear all the scary noises when you don't have exhaust

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Timeing chain interchangable?

fpelchaiv

fpelchaiv

Hoosier Rick

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fpelchaiv

manbearpig

fpelchaiv

zerogravity58

fpelchaiv

fpelchaiv

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Rebel n Dirt

oldeerslayer

bent wrench

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