hello. just rebuilt a 350 with camel heads and a bigger cam.engine does not have a 1000 miles. ive changed oil once cause it got black. now its black again. whats up? thxs

Sounds like your rings haven't seated in yet. Combustion gas is getting into the oil and turning it black. May take some more time to seal up.

That's pretty common on a newly rebuilt engine that hasn't fully broken-in yet. Some of it is probably just moly assembly lube. Just make sure you're using a good quality oil filter to catch the extra stuff so it doesn't circulate in your engine.

I am sure the block was not plate honed, Do a leak down test at TDC as that will answer your qestion.

We build a lot of circle track engines and the guys with rags around their breathers as did not have thier blocks plate honed and even after 3 years of racing they still need the rags around the breathers so I would say the the rings really never get broke in.

The cylinder in this pic is from a 502 bought new that was using a oil and I would say by the looks even with a 100,000 miles these rings were not going to break in.

http://i7.photobucket.com/albums/y276/CNCBLOCKS/glazed.jpg

Take it out and flaunt on it really hard for a couple hours but don't overheat it. Building up pressure by running it harder will help seat things down quicker.

Take it out and flaunt on it really hard for a couple hours but don't overheat it. Building up pressure by running it harder will help seat things down quicker.

We have seen guys 3 years of cirle track racing and still have not seen them seal.

Leak it down at TDC and see what you have got.

We have seen guys 3 years of cirle track racing and still have not seen them seal.

Leak it down at TDC and see what you have got.


maybe they weren't giving it their all ;) ;) ;)

cnc, that picture to me looks like the cylinder wall is untouched and brand new. with my lack of knowledge, if i understand this correctly, you are pointing out the crosshatchings on the walls, saying there there is not vertical scaring from the rings?
i pulled a 454 from a yard, bored .030 over and am seeing the same thing on the walls.

thx

cnc, that picture to me looks like the cylinder wall is untouched and brand new. with my lack of knowledge, if i understand this correctly, you are pointing out the crosshatchings on the walls, saying there there is not vertical scaring from the rings?
i pulled a 454 from a yard, bored .030 over and am seeing the same thing on the walls.

thx

its the other areas that aren't sealing you can see, its not the hone job your looking it. the cyl is not round when the head is torqued on

I knew an old farmer who would dump Ajax down his carb on his flathead tractors to "lap in the rings".:crazy: True story

I knew an old farmer who would dump Ajax down his carb on his flathead tractors to "lap in the rings".:crazy: True story

old farmers know how to do everything
i swear some of their stuff has 100000000000000 miles on it