Alright I知 stumped.

I finally got the motor and all accessories together on the vette this weekend.
I started her up on Saturday. It fired right up; I tweaked the distributor and set the idle at 2000RPM for the 20 min break-in. It ran fine, no ticking, no knocking, I let it idle then revved it a few times and it was running better than I expected. I put timing light on it to set the advance. To my disbelief I was at 50 degrees. I had vice grips on the vacuum advance tube.
Well that can稚 be right so took the cap off and checked to see if the rotor would spring back. It did. I also checked to see if I threw a spring, I didn稚. I did change spring to get my timing to come in later (heaver springs), so I might swap back to the original ones.
My next thought was my new balancer timing mark was off. I checked it before I put it on, but I thought I should double check it. I took the balancer bolt out and felt where the key way was. It was in the same location relative to the timing mark as the old one.
If I turn the distributor to retard or advance the timing it will stall. It痴 like it wants to run with 50 degrees of advance. I then turned up the idle screw and backed off the timing. I was able to get it to 12 degrees advance. But now I'm getting a backfire thru the carb. I also thought I might be off a tooth, so I tore it all apart and checked. The marks line up perfectly.

I知 sure I知 just missing something simple.

I appreciate your input.

Mild cam
Performer intake

 

Assuming the balancer has not slipped and is marked correctly, the only thing I can think of is to verify the timing light is connected to #1 plug.

 

Thanks, That was my first concern. I double checked that and used 2 lights with the same results.

 

completely disconnect that vacum line and use a golf tee to plug it,,their cheap and work great.That thing shouldnt even start with a 50 degree advance so you know somethings not right. Can the dist. be off one tooth? Its been to long since I have messed with rebuilding one, I forget.

 

If it's a new dist. you may need to adjust your vacuum advance can. Mine was doing the same thing.

Chris

 

Thanks Chris

It's not a new distrubutor, but I did put heaver springs (i was all in at 1800) I also backed the vacume advanced screw all the way out for initial tuning. I'll play with that.

 

Pull the #1 spark plug and check to make sure that the timing make on the balancer lines up with the tab when at TDC. Do the old pull the spark plug out and put your finger in the hole and turn the engine over by hand till you feel pressure. Check that the timing mark on the balancer is getting closer and closer to 0 degree mark on the tab.