6066 (1960-1966) GMC Truck Club

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-   -   Tiiming Chain Replacement (https://6066gmcclub.com/showthread.php?t=49632)

kchampagne October 4th, 2016 02:37 AM

Re: Tiiming Chain Replacement
 
Excellent! Thanks everyone for the great advice! I am getting ready to ramp up my suburban project so I will post some updates on my build page.:thumbsup:

Clarke October 4th, 2016 03:41 AM

Re: Tiiming Chain Replacement
 
Curious, I pulled my '62 305D out several years ago to replace all the seals and gaskets and repaint it. I remember checking the chain slack and like TJ I was surprised by the amount of slack, but it was still within toleance with 50K original miles.

However, I dont recall mine having a double chain/gears. Maybe it does and I forgot? If it doesn't do you have to change the cam, or do you simply add a second gear?

bigblockv6 October 4th, 2016 04:46 AM

Re: Tiiming Chain Replacement
 
There is no need to change the cam, you just have to get the full double roller timing chain and sprocket set.:ok:

Clarke October 4th, 2016 05:43 PM

Re: Tiiming Chain Replacement
 
Quote:

Originally Posted by bigblockv6 (Post 63950)
There is no need to change the cam, you just have to get the full double roller timing chain and sprocket set.:ok:

Sounds easy enough... Unless I'm mistaken, I'm under the impression that excessive slack in the timing chain is one of the top gambles in a high mileage BBV6? Or worded differently, one of the first areas requiring attention on a high mileage BBV6?

What's the advantage of having double roller set up compared to single? Less wear/stretch in the chain over time?

1972RedNeck December 18th, 2016 06:10 PM

Re: Tiiming Chain Replacement
 
Quote:

Originally Posted by Clarke (Post 63955)
What's the advantage of having double roller set up compared to single? Less wear/stretch in the chain over time?

A double roller chain is 1.7 times stronger than the same size single strand chain...


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