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Topic: A puff of smoke(no not pot)

in Forum: C3 Engines

A puff of smoke(no not pot)

Posted: 8/14/10 7:49pm Message 1 of 5
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Rocklin, CA - USA
Joined: 4/2/2005
Posts: 484
Vette(s): 1970 T-Top350/350hp numbers matching 4 speed. It's a mess and 1970 Convertible 4 speed.
Another problem with the 70 when going down the highway at about 70mph I notice a puff of white smoke. Its very faint and it does it every 5 sec's. What would cause this ?


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A puff of smoke(no not pot)

Posted: 8/14/10 8:18pm Message 2 of 5
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HOWELL, NJ - USA
Joined: 5/18/2004
Posts: 6812
Vette(s): 1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.
White smoke? Sounds like it could be a head gasket...


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A puff of smoke(no not pot)

Posted: 8/15/10 7:24am Message 3 of 5
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Woodland, WA - USA
Joined: 10/14/2003
Posts: 1171
Vette(s): 1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion
Hope you will get a little more help, I would do an compression check, and inspect each of the plugs to see if anything out of the norm shows up.


A puff of smoke(no not pot)

Posted: 8/15/10 8:17am Message 4 of 5
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
I would look for something leaking onto the exhaust first. The "every 5 seconds" comment leads me to think that perhaps there is a coolant, or oil leak that is dripping onto the exhaust, and creating the puff. Of course, it could be something more serious, but I would definitely start with the simple stuff.
If you can't seem to find a small leak, or evidence of one, then you'll need to dig deeper to see if it might indeed be a head gasket or something like that. Good luck!



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A puff of smoke(no not pot)

Posted: 8/15/10 8:37am Message 5 of 5
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Rocklin, CA - USA
Joined: 4/2/2005
Posts: 484
Vette(s): 1970 T-Top350/350hp numbers matching 4 speed. It's a mess and 1970 Convertible 4 speed.
Yes I did not have a drainage hose from the expansion tank it has one now. I will check to see if that was the problem.


in Forum: C3 Engines


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