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Old 04-02-2011, 11:09 PM
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355 smoking?

Hi all,
I have a 1985 K5 blazer with a 355 that I completely rebuilt about 6 yrs ago. It has maybe 10,000 miles on the motor. Just recently, it started blowing blue smoke out the tailpipe. It's most noticeable when taking off from a stop or under acceleration. The motor runs great, there's no blowby out of the oilcap and has good compression (160psi avg). I'm thinking a bad intake manifold gasket (sucking oil from underneath, it does idle a little high) or worn intake valve guide and/or seal?
Thanks for any ideas,

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Old 04-03-2011, 02:01 AM
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