My 428 smokes out the right side only. Happens when I accelerate, or even tap the gas in neutral. I have narrowed it down to #1 cylinder. Here's the facts:
All plugs look like new, .....white porcelin with a bit of tan showing, except #1. #1 has porcelin the colour of battleship gray and the center elctrode was a bit wet with what I think is oil.
A compression test shows 196 psi in all cylinders (well, most....I didn't check all), and a tiny drop in cylinder #1.....i.e. 195 psi....barely the width of the gauge needle.
If I disconnect the sparkplug wire from #1 cylinder, the smoking completely stops.
The smoke is white/gray, but smells like exhaust and is definately not water (steam). I thought oil smoke was usually blue, but maybe not, as I am running synthetic.
I removed the valve cover and the valve seals for #1 cylinder appear OK.....positive type and still fastened around the valve guides.
I can't tell about the intake manifold gasket, but it's my best guess so far. Kind of a pain to change, but it's probably my next step. Maybe I'll swap valve seals around first....hmmmm.....
Engine has about 3000 miles on it. Problem may have always been there. I used to get too much smoke from accelerating. Changed the white accelerator pump cams to black and the smoke dissapeared from the left side, but left this problem still on the right side.
I was tinkering with the timing. I moved it from 10BTDC to 15BTDC when I disscovered my max total advance was only 24 degrees. After I did that, the smoke was way worse. No surprise as I'm sure intake manifold vacumm increased quite a bit with the ignition timing increase, therfore sucking in more oil, fuel, or whatever.
Oh......I use twin Holley's on a single plane divided plenum manifold. I can't see how it could be a problem. Even if it was puddling fuel on the manifold floor, more than one cylinder should be affected. But I mention it anyway just in case.
Any thoughts out there before I start tearing things apart? I appreciate any thoughts on the matter. Thank-you.