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Old 03-14-2006, 03:16 PM
84 Z28 Convertible
 
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My Sbc 400 Smoking

I rebuilt my SBC 400 in July 2004, but have only put about 500 miles on it and she has yet to quit the little blue smoking. The rings has to be seated by now so im thinking that I might have other problem. I notice when I was changing the headers to long tubes the # 8 exhaust was smudge of black and all other seem to be burning clean. Every component of this engine was bought new to include the AFR Heads. The engine has Wiseco piston and ring and I triple check when installing the rings to make sure they were correct. Im just confuse with this $6000+ investment.
Any clue whats going on here and why I cannot get rid of the smoke? It's not heavy but its enough to see at idle while staring at the exhaust pipe.
Maybe a leakdown test will tell whats the problem......

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Old 03-14-2006, 03:49 PM
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try a leakdown test and compression test on that one cylinder (or all of them to be safe) the rings in that cylinder may not have seated correctly for some reason or may have cracked a ring. did you make sure the ring end gaps were set correctly?
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Old 03-14-2006, 03:51 PM
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BLUE SMOKE it could be oil leaking past the valve seals you might want to check that out
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Old 03-14-2006, 03:53 PM
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Did you fit the rings to the cylinder when you put it together? Is it possible that you have a damaged oil seal on one of the valve guides? I once had a broken oil ring on one cylinder of a 400 sbc but that was after 3 years of racing it.

VC
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Old 03-14-2006, 06:56 PM
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ring gap was set up at .018 as per the instruction for Wiseco pistons. They are included with the pistons.
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Old 03-14-2006, 07:51 PM
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Is your PCV valve properly baffled? Could be sucking in some oil from there. Make sure the modulator valve is'nt leaking sucking fluid into the intake if its a auto trans. Did the heads come assembled? Make sure the valve seals are installed properly and not pulled off the seats easy to see with a flashlight and the V cover off. Look for the simple things before you condemn the rings.
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Old 03-15-2006, 01:42 AM
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The PVC Valve and the breather has baffles inside of the Valve Cover (Edelbrock Tall). I guess the leakdown test and a look at the valve seals for that cylinder. I belived that it has to be that cylinder because that was the only header bank that look to have the smuge, so The valve seal and work my way down.
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