Carb is running too rich!

[DarkoNova]

What's an easy way to verify tdc without a piston stop? I guess I could pull the belts and crank pulley and put the degree wheel back on and use my dial indicator on a valve.



It's just that I did all that when we installed the cam so I don't really want to do it again. If there's an easier way, I can do it.

Initial timing was only 9°. With vacuum advance connected to full manifold vacuum, it went up to 19° at idle. So my distributor only gives 10° with vacuum.

Distributor is an MSD pro billet.

I bumped the timing up to 16° initial, I forget what the total was at 3000. I knew I should have written it down.

I have an adjustable vacuum canister, I just didn't want to install it right now because I'm already having such a hard time getting the carb dialed in. I didn't want to add more stuff to mess with.

So far at 900 rpms I have 13" of vacuum.

I'm pretty sure the O2 sensor is useless at this point. I took it for a few test drives and the first two with the low initial timing, it just showed 9.0. After bumping up the timing, it maxed out at 10.7.

We pulled a plug and it looked almost perfect. The threads were black but the porcelain was a dark tan color. Darker than ideal, but nowhere near as bad as the old plugs.

I'm probably going to get a new O2 sensor just to rule that out.

[eville]

You set initial with vacuum disconnected and plugged. Mechanical advance also with vacuum disconnected and is checked at 3000 rpm. The mechanical advance is controlled by weights and bushings in the distributor. When it’s “all in” is controlled by the springs in the distributor.

Measure initial and total timing then report back.