Thread: 352 valve cover blowby

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Originally Posted by DennyW

If it's not smoking out the tail pipe, and the PCV valve is working, you need to pull the valve covers, and check the oil drains in the head. Also, if it smokes when you first start it up, that is an indication that the valve seals are probably bad. That, along with plugged oil drains will cause this. Also, if the drains are plugged, the PCV valve cannot pull the vapors from the opposite side. Which causes smoking (blowby) to continue coming out the valve cover. And make sure the breather side breather is clean.

DennyW, can you please tell me where on the heads I can find the oil drains on a FE 390? is there more than one per side? What would be the best way to clean the drain? Maybe with a rod and some Seafoam?
TIA

I have to ask...................how do you do yours????

DennyW, your the man Thanks for the pix, that was awesome of you. I think my drain holes may need to be cleaned I may go look for those brushes they use to clean gun barrels with??? What do you think of doing a Seafoam motor flush? Bad idea?
TIA