Help! 1969 350 300hp timing degree

[1969stingray]

Does anyone know what the timing degree should be for a 1969 350 300hp with a 4 speed manual. I have been told many different numbers from 0 degrees to 12 degrees at idle.
Thanks, Ron

Also any good advice on idle adjustment for Rochester carb.

 

[Vettehead Mikey]

The factory number should be on the tune up sticker under the hood or in your shop manual. Do the dwell adjustment first.

 

[1969stingray]

Thats the problem I am having the sticker is gone and the repair manual says the timing should be TDC and I am not sure this is right.

 

[gmjunkie]

Thats the problem I am having the sticker is gone and the repair manual says the timing should be TDC and I am not sure this is right.

That is "Correct" with manual transmission!~!!

 

[toobroketoretire]

Initial Timing

Does anyone know what the timing degree should be for a 1969 350 300hp with a 4 speed manual. I have been told many different numbers from 0 degrees to 12 degrees at idle.
Thanks, Ron

Also any good advice on idle adjustment for Rochester carb.

The initial timing should be set to 6 degrees with the vacuum advance can disconnected.

 

[lars]

If you need to pass an emissions test, set initial timing between 0 and 6. But if you want the car to run right, be sure to read my papers on how to set the timing, available by e-mail request from me. You don't set the timing to an initial timing spec for best performance.

Lars
V8FastCars@msn.com

 

[toobroketoretire]

Initial Timing

If you need to pass an emissions test, set initial timing between 0 and 6. But if you want the car to run right, be sure to read my papers on how to set the timing, available by e-mail request from me. You don't set the timing to an initial timing spec for best performance.

Lars
V8FastCars@msn.com

When G.M. settled on the 6 degree initial advance figure they were taking into account the worst case scenarios such as where the car (or truck) is being operated and how much of a load is being placed on the engine. As many of these cars journey deep into Mexico where the gasolines often have octane ratings in the low 80's they picked 6 degrees to ensure no engine damage would occur. But for operation solely in the United States the initial timing can usually be advanced up to 16 degrees without any damage.

 

[lars]

Initial timing setting and advance curves were set up to meet emissions requirements - not to meet Mexican fuel requirements.

For best performance, initial timing is irrelevant, and the engine should be timed to 36 total. This will be within 2 degrees of optimal timing for most American V8s with standard (not fast-burn) cylinder heads.

Lars