White smoke when decelerating above 50 MPH
Thread Starter
Racer
Joined: Feb 2005
Posts: 336
Likes: 0
White smoke when decelerating above 50 MPH
I bought Corvette in Feb of this year. Car has had a 2003 valve job. when purchased the car I looked at car the weekend before I picked it up and failed to check oil. Could not imagine him driving it to meet me without oil. When I had paid for car and was about to leave, I checked oil, to my surprise no oil, he gave me one that is all he had then I took to local station to add 2 more. He gave me a song and dance, but had already given him a cashiers check and he had signed over title. Car uses a mild amount of oil. 1/2 quart in 600 miles. Does not smoke except when I go over 50 and back off on the pedal hard. Then it smokes especially if I am going 75 or so and let off gas quickly to decel. I assume I need valve seals, but what else shall I look at? It does not run hot. 
Safety Car
Joined: Jun 2002
Posts: 4,135
Likes: 1
had the same problem when i bought my 73 . he was a circle track engine builder and stroked the orig l-48 to a 383. when i bought it it also was low on oil,, the oil milage was horrible,250 miles a quart and i noticed the same thing,when i backed off the gas on the highway,she smoked,we tore the heads off,and he had the intakes opened to 2.02,but cheesed with the valve guides,they were worse than a car with 200,000 miles so the machine shop re-did all the guides and put the umbrella seals ,,ect,,, milage now varys 850 to 900 a quart depending how hard i drive it,, one thing the machine shop said is that due to the fact that the guy put in chrome moly rings,and the rings had a constant bath of oil,they never broke in right,how true that is i dont know,,,the vaccume drops when you let off the gas at that speed and the oil gets sucked in thru the guides,one day i was thinking of re-ringing my stroker,but for now the oil milage seems pretty normal,but i have spoke with other stroker owners who claim that they dont use any,
Racer
Joined: Mar 2005
Posts: 343
Likes: 0
From: San Diego CA
St. Jude Donor '05-'07
I have had some issues with oil and valve (seals?) leaking since mine was stroked. Luckily the place that did the work for me considers all that warrenty and had taken it three times to change seals and search for leaks. Is it common for the strokers to use/leak oil?
Tech Contributor
Joined: Aug 1999
Posts: 15,175
Likes: 3,990
From: Connecticut, USA
Had a similar problem, 200miles/QT, new heads. Found out I used the wrong intakes gaskets and had 5 broken rings! No leaks,no fouled plugs, no smoke at idle.
Edelbrock told me to use Fel-pro #1256 w/Peformer intakes
#1205 w/RPM intakes
Good Luck,
Gary
Edelbrock told me to use Fel-pro #1256 w/Peformer intakes
#1205 w/RPM intakes
Good Luck,
Gary
Team Owner
Joined: Oct 1999
Posts: 34,034
Likes: 222
From: Land of Thunder
2018 C2 of Year Finalist
St. Jude Donor '12-'13-'14-'15, '19
White smoke means one of two things:
1) a new Pope has been elected.
or
2) I thought it meant a cracked head that was allowing antifreeze into the combustion chamber. Isn't oil burning always blue?
1) a new Pope has been elected.
or
2) I thought it meant a cracked head that was allowing antifreeze into the combustion chamber. Isn't oil burning always blue?
Drifting
Joined: Nov 2001
Posts: 1,469
Likes: 6
From: 68 427 4.11s Roadster
Oil could be seen as white but white is a check on the coolant. Since oil is disappearing, more so since this is where it can go too. Into the coolant. And the top worst is coolant going into your oil.
Safety Car
Joined: Jun 2002
Posts: 4,135
Likes: 1
Originally Posted by Techno
Oil could be seen as white but white is a check on the coolant. Since oil is disappearing, more so since this is where it can go too. Into the coolant. And the top worst is coolant going into your oil.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Racer
Joined: Feb 2005
Posts: 336
Likes: 0
Thanks to all for your advise, I know I have some work to do. The coolant is ok, has not changed, so I know I have a valve, ring, gasket or head problem. Just was curious whether a vacumn issue or carb issue could do be problem. I did have a black problem but adjusted carb and idle to get that under control. Also found that the vacumn hose to carb that was to go to Distributor was crossed with the one that went to the Vapor recovery canister. I am still new at this game. Thanks again for all your thoughts!!!!
