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351C 2v - smoke issue


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Here the quick back story

Back in 2003 my dad and I bought a used 351C and had it completely rebuilt. I was planning on swapping out the 302 for the 351 in 2004 but I ended up going to college and life got in the way. Fast forward till now.... I took the car to the shop for the swap which included the c6 Tranny. The engine idles perfectly fine and starts right up.

 

but... once you turn it on, it starts blowing blueish smoke on the left exhaust (no H pipe) It takes about 1 minute warming up before it blows smoke. Do y’all think it’s the valve stems? I figure they might have  dried up after not running for 18 years. I have videos of it as well

Edited by 73FastBk
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If it was rebuilt with umbrella seals that is a possibility. Another possibility is rust and/or frozen rings. easy enough to pull the valve cover.

After that I would start with a compression test of all 8 cylinders.

Another possibility is the intake gasket is leaking,

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“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

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8 hours ago, Don C said:

If it was rebuilt with umbrella seals that is a possibility. Another possibility is rust and/or frozen rings. easy enough to pull the valve cover.

After that I would start with a compression test of all 8 cylinders.

Another possibility is the intake gasket is leaking,

Thank you  very much, I will look at those options before having to tear it apart. I just want to make sure I do everything else before pulling the engine out. Thanks again :34713505_1:

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