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Advance or Not to Advance? [message #363229]

Mon, 05 April 2021 08:47

Tom Katzenberger

Messages: 399
Registered: June 2019
Location: Kingsville, MD

Karma: 4

Senior Member

Guys,

I am installing a new timing set on an engine with 8,000 miles on it. it ran beautifully with the stock timing set, but I wanted to get rid of the 40 year old plastic gear set. I am replacing it with a Edelbrock double roller.

The question is: Should I advance the timing set 4 degrees to lower the torque band or leave it at the stock setting beings the engine only has 8,000 miles?

Thanks,
Tom Katzenberger

Tom & Oki Katzenberger, Kingsville, Maryland, 1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark Control, Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan W/Bovee Ignition

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Re: Advance or Not to Advance? [message #363231 is a reply to message #363229]

Mon, 05 April 2021 10:13

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

Tom Katzenberger wrote on Mon, 05 April 2021 09:47

Guys,
I am installing a new timing set on an engine with 8,000 miles on it. it ran beautifully with the stock timing set, but I wanted to get rid of the 40 year old plastic gear set. I am replacing it with a Edelbrock double roller.
The question is: Should I advance the timing set 4 degrees to lower the torque band or leave it at the stock setting beings the engine only has 8,000 miles?
Thanks,
Tom Katzenberger

Tom,

My experience with can-shifting a 455 is near zero, but I bet if you put out a call (email or whatever) to Dick Paterson, he could give you a very good answer.
My experience is that with a mild or stock cam, it might now get you very much. Cam-shifting I did really only matters near WOT.

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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[GMCnet] Re: Advance or Not to Advance? [message #363236 is a reply to message #363231]

Mon, 05 April 2021 11:22

James Hupy

Messages: 6806
Registered: May 2010

Karma: -62

Senior Member

There are two good reasons to advance the cam timing in a semi-stock
engine. One, to verify that all your timing marks are accurate (most of the
time, they are not), and two, as the chains break in, they stretch a bit.
This retards the CAM TIMING. So, if you start out with 4° or so of advance,
when it stretches it comes closer to correct. Many more considerations
here, but bandwidth police don't like my extremely detailed responses. If
you want more in depth explanations, contact me off gmcnet.
Jim Hupy
Salem, Oregon

On Mon, Apr 5, 2021, 8:13 AM Matt Colie wrote:

> Tom Katzenberger wrote on Mon, 05 April 2021 09:47
>> Guys,
>> I am installing a new timing set on an engine with 8,000 miles on it. it
> ran beautifully with the stock timing set, but I wanted to get rid of the
>> 40 year old plastic gear set. I am replacing it with a Edelbrock double
> roller.
>> The question is: Should I advance the timing set 4 degrees to lower the
> torque band or leave it at the stock setting beings the engine only has
>> 8,000 miles?
>> Thanks,
>> Tom Katzenberger
>
> Tom,
>
> My experience with can-shifting a 455 is near zero, but I bet if you put
> out a call (email or whatever) to Dick Paterson, he could give you a very
> good answer.
> My experience is that with a mild or stock cam, it might now get you very
> much. Cam-shifting I did really only matters near WOT.
>
> Matt
> --
> Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL,
> GMCES
> Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum
> Brakes with Applied Control Arms
> SE Michigan - Near DTW - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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Re: Advance or Not to Advance? [message #363238 is a reply to message #363229]

Mon, 05 April 2021 14:58

Tom Katzenberger

Messages: 399
Registered: June 2019
Location: Kingsville, MD

Karma: 4

Senior Member

Than you Jim and Matt,

I settled with "0" as the engine is totally stock and only 8,000 miles with a double roller chain. I don't think I will need to push the stock engine.

Now I am trying to set the crank seal. The book has .005 using the special tool. I do not have a special tool and I flushed the seal to the inside of the timing cover, but I am not sure that is the best depth? Is there a method to set the seal depth without the special tool. Will .005 behind a washer work?

Thanks again,
Tom

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