Among other things to go over we'll have to recheck it before Sonoma Vince. Let me know what day works best for you.

Going to be all in at 2000 RPMS - with a blue stop bushing? Then you've got to run the TWO light silver springs....

Or I could throw the black bushing in and shoot for 2500 rpm :headscratch:

We'll see

STOP BUSHINGS only control the AMOUNT OF ADVANCE the advance weights can ADD....


So depending on which color stop bushing you have --- really controls your INITIAL timing.... the initial -- whatever that is set at --- and the color bushing you use determines how much timing will be added in total.

SO ===

Black bushing allows for 18* to be added to whatever number you set the idle (initial) timing at. If you set that at 10* --- and added the 18* --- your total would only be 28*..... So if you wanted to be total timing at 32* you subtract the 18* for that particular bushing (the black) and set your initial.... i.e., 32 total is the desired timing --- then 14 initial is what you would be at idle.


Blue bushing is a 21* bushing --- so then you could set initial at 11* to get to your 32* total


And so on.


The SPRINGS and their various combinations -- are what CONTROL the RATE of the timing advance.... So when and how quickly you can get to your max advance (total timing).


So two light silver springs with the black stop bushing gets you in near 2000 rpms

One light blue and one light silver - gets you all in around 2500 rpms


and so on.


There's a chart - that can be found here -- showing the various spring combos' and where -- with what bushing choice -- your timing curve is going to be AS SHOWN ON PAGE 3 --- so just scroll down....


https://www.msdignition.com/uploaded...structions.pdf



If it was my motor --- I'd be running the BLACK bushing and either the two light silvers or the light silver/light blue combo. I'd set the initial timing to 14*
Adjust the idle to where I want it - double check my timing and go drive it.
Initial timing being "off" won't hurt a thing --- it's the total timing and how fast it gets there that can cause "pinging" or pre-ingniton.

Too much timing can cause bucking (like a miss) at light loads at freeway cruising... much like a lean miss... but at 32 or 34 total and NO vacuum advance - you're not going to be too far off.

Tried blue springs/blue bushing.......car hated it. Went to silver springs and she was as crisp as ever.
Took her out for a ride and I'm still getting the hesitation under load. Looked for a broken valve spring but couldn't find one.
Replacing MSD box tomorrow. :hairpullout:

I could have missed this earlier in the thread, but have you checked your fuel filter? Sure sounds like a fuel related issue to me.

Thanks Scott, going to be checking that tomorrow also. I pulled the line off on the carb side of the filter a couple of weeks ago and fuel kept dumping through the fuel filter freely and what appeared to be a healthy flow so I assumed it was good but going to pull it out tomorrow if its not the MSD box.

I'm sure it's better than the distributor cap.


:lmao:

I put the two light silvers on today (all in at 2,500) and bumped the initial to 15* with the 21* advance stop and my motor loved it. Idle is set at 1,000.

As mentioned fuel filter or maybe pump failing?

Nothing an LS swap won't cure and he has plenty of time to git 'er done!