bck

Some were uniformly coated in black just like the exhaust ports. Some looked like the one on the right which blows up well. I didn't notice any spots.

Black Baja

iTrader: (2)

If the plugs were idled on it will clean it off. I think I have some plugs and Pistons at home if I do I will post some pics of what I'm talking about... In the mean time what I mean is when you have a nice chocolate looking porcelain with some random black dots on it.

bck

Like you said, a little lean. Doesn't seem like lean enough to kill it. The plugs and exhaust seem to show rich. Water temp never moved. Oil temp got up to about 240.

bck

I don't think I really have black stripes on the side of the pistons from lack of sealing. I think it's more like black scored and scuffed and burned aluminum from scraping the bores where those marks are visible.

SB

iTrader: (1)

This is where a spark plug reading tool with magnifying glass and light can really help. IE: look thru the dark or blackness. By the looks of that picture showing the two middle cylinders on a low quality monitor, I'd be willing to bet you have some aluminum 'dust' (from your piston tops) in there.

I've dealt with many motors that have been too lean while cruising and pig rich at WOT. Some vice versa too. Makes reasing things a little tougher without the right tools and references.

14 apache

iTrader: (1)

Whats the deal with the adapter plate for the exhaust? Is that the bolt pattern for the 700sci?

bck

I have the old style CMI big tubes. They don't have the necked down pipes/ flange. The primary pipes and flange are too big to bolt directly to the heads

bck

What exactly do you see that indicates that? Although the side of the pistons are physically damaged(not just discolored), the tops don't have any visible damage that I can detect.

Budman II

iTrader: (1)

Well, it looks like they didn't spend a whole lot of time trying to get the valvetrain geometry right.

bck

I think someone mentioned earlier about oil being baked on to the bottom of the piston? This is the only pic of the bottom I have now. I'll get some more later