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819 Posts
You've got too much crankcase pressure. Check to make sure your PCV valve/s aren't clogged, lines from the PCV to carb run correctly or clogged.
My 351 did that after a rebuild even with the lines run correctly and everything looking good. I eventually had to let one of the PCV's evacuate directly to atmosphere.
My 351 did that after a rebuild even with the lines run correctly and everything looking good. I eventually had to let one of the PCV's evacuate directly to atmosphere.