[68 P.O.S.]

Originally Posted by GreyGhost85

Ok so I I went ahead and plugged the piston stop in, wrapped end with tape so it doesn’t scratch cylinder head, used a reference point on crankcase cover, turned clockwise marked, turned counter clockwise marked. Split the distance between the two and the initial factory line/groove on the harmonic balancer is perfectly at 0 degrees on the scale. So the piston stop provided some insurance in regards to that factory mark. There you go, glad your balancer matches up with TDC. Makes things a little easier. Read the following links for timing. They're written by a GM engineer and will tell you everything you need to know about timing and vacuum advance and the science of why.
http://www.camaros.org/pdf/timing101.pdf
http://67-72chevytrucks.com/vboard/s...d.php?t=274806


So let me get this correct.

1. Disconnect vacuum advance again and set initial timing or base timing to 8-12. If I plug in vacuum advance this rpms will be at least 1400. Set up this way, can you adjust your rpms down to 750 at idle? If not, you'll have to pull the carb and adjust the transfer slots square. Did you check out the link I posted on doing this?

2. So with base timing set to 8-12 and vacuum advance plugged into carb,I need to reset the carb idle mixture screws and idle screw per manual? In order to accomplish a perfect mix with a perfect idle? Correct, set it up the way you would drive it. Plug your vacuum gauge into the manifold vacuum port on the carb, hook up your timing light so you can view rpms, and follow the procedures in the manual. This will achieve your best lean idle.

3. Once everything is set, test vacuum on ports? Most of my full vacuum ports are plugged. No worries if they're all being used. Using a T, connect your vac advance and vac gauge to the manifold vac port on the carb, then follow the procedures in the manual for setting the IMS

Let me know if my method is off. So far battery starting issue is gone. Side notes*** 3 degrees retarded with advance plugged in and idle set to 700 gives me reverse for 20 seconds or so.
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