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Old 09-08-2006, 06:28 PM
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thick black smoke

The car:

70 chevelle
Fresh 350 (about 400 miles on complete rebuild)
Comp cam 262
Brodix IK180 aluminum heads with Brodix recommended head & intake gaskets (heads 2 months old)
Holley 670 street avenger (one month old)

The issue:
I have been driving this car just about everyday for the past few weeks with no issues till this morning. I was warming it up just about to leave for work and out of the blue it was like uncorking a stove pipe.. thick black smoke started spewing from the drivers side exhaust. After letting it run for a bit (and popping the hood) the engine sounded no different than it has before, with no popping, sputtering or valve clatter going on. I didnít have a chance to inspect further due to the fact I was leaving for work.. So here I am at work dying to fix the poor girl and wondering what it could be.

My guess is carburetor clogged...any thoughts would be appreciated

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Old 09-08-2006, 10:29 PM
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If it was thick black smoke that has to be oil man, ethier the seal on the piston went out or the valve. Also a easy way to check with out pulling the head is to check the spark plugs on the driver side(well assuming because you said the smoke came out from that side so another thing is if you have a cross pipe or true duals if it's true duals then you know for sure it's that side). If the pulgs are really oils and or really black then yep it's oil in the cylinder.
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Old 09-08-2006, 10:35 PM
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Sounds to me like your choke is stuck on the carb, black exhaust is too rich and bluish gray is oil.....check your choke.
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Old 09-08-2006, 10:43 PM
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true but then again it depends on the oil wieght and color or brand sometimes as in the quality, but i still would check the spark plugs i think if there is like black or soot on them its too rich.
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Old 09-08-2006, 10:48 PM
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You got a leaky spark tube...
 
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Gilby, is there a strong unburnt fuel smell coming from the tailpipe?
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Old 09-08-2006, 11:08 PM
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black smoke means its rich...and yes, it smelled strongly of fuel.
Although if it were carb related why would it only effect one bank and not the other?. (hoping it carb cause thats an easy fix)
Put in a solid 13 hours at work today so I didnt have a chance to investigate.

BTW- Im using Delo 400 oil
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Old 09-08-2006, 11:09 PM
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Pull and check the driver's side plugs...possibly a gasket? If you are getting smoke on one side only that kind of rules out carb issues...
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Old 09-08-2006, 11:34 PM
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You got a leaky spark tube...
 
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Check your spark plug wires, maybe you have one that came loose.
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Old 09-09-2006, 04:57 PM
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possibly a weak plug?
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Old 09-09-2006, 05:00 PM
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thick black smoke

Did you check and see if maybe a valve cover might have come loose and is leaking oil ?
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Old 09-09-2006, 07:17 PM
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three of the four plugs on the drivers side looked quite black from running rich. I pulled the carb, cleaned it... slapped it back on and let it idle for about 20 minutes... seems fine now.
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Old 09-09-2006, 07:22 PM
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Quote:
Originally Posted by gilby246
three of the four plugs on the drivers side looked quite black from running rich. I pulled the carb, cleaned it... slapped it back on and let it idle for about 20 minutes... seems fine now.
i take it your intake is a single plane? if so r u using a divider plate?
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Old 09-10-2006, 07:02 AM
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not a single, its a Performer RPM manifold.... Im still not convinced it was the carb (didnt find anything during the cleaning). Seems strange to me it would effect one side and only three pugs (# 1 plug was clean as well as the plugs on the other bank) . Regadless, It was raining yesterday so I didnt get a chance to run it. will be doing that this morning
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Old 09-10-2006, 07:07 AM
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Quote:
Originally Posted by gilby246
not a single, its a Performer RPM manifold.... Im still not convinced it was the carb (didnt find anything during the cleaning). Seems strange to me it would effect one side and only three pugs (# 1 plug was clean as well as the plugs on the other bank) . Regadless, It was raining yesterday so I didnt get a chance to run it. will be doing that this morning
the reason i ask i knew a guy who used a weiand single plane with divider plate and it would always burn #8 piston. he said it was too rich on that side. thats what he'd say, i took his word for it because he was an ase certified mechanic.
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Old 09-10-2006, 08:24 AM
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Probably a blown power valve. What ever it is you need to fix it kwick. That fuel will run past the rings and dilute the oil and ruin the crank and bearings.
I speak from past experience. Ruined a new 400 small block in 17 miles because of a blown power valve. I had to drive it home rather than call a wrecker.
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