Senior Tech Team
Join Date: Apr 2004
Location: West Hills California
Re: Blown Head Gasket? Intake Gasket? Worn Valve Guide? 350 SBC
Just another thought here, Is the smoke you are getting constant and an extremely large amount, or is it more of puffs on startup and sort of smoky deceleration....????? Good bet that your intake valve guides are allowing oil to get buy. You can try to install some umbrella seals since you already have the motor back together. If this fixes it..... they lasted a really long time on an old 56 Chevy I had. They were a pain in the ass to install(serious sludge)but they lasted until I changed the powerglide to a 3-speed and blew the motor up. I hope this helps.
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