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Father has a 86 grand national, has blue smoke in the exhaust and rough idle, no oil apparent in the turbo exhaust side. Turbo was rebuilt be previous owner, wanting to replace with a stock turbo, what is good recommendation, wants to be a weekly driver.
 

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The blue smoke will most likely be cause by leaky valve seal. If the seal was never service which 1986 :D. I will bet its the valve seal.
 
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