Advance or Not to Advance?

[Tom Katzenberger]

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.

 

[Matt Colie]

> 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

 

[Jim Hupy]

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

> > 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:
>

 

[Tom Katzenberger]

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
--
Tom & Oki Katzenberger,
Kingsville, Maryland,
1977 23' Birchaven, 455 C.I.D.