At least on poly , it is NOT all the time . The valve cover actually fills up with oil until it goes down a push rod hole on poly . That height is above the lower edge of cover / gasket . Caused by crud in rear drain hole , in block —- and on poly aggravated by the passage is not straight down to pan — it goes sideways about an inch in the head . I do not know about B block heads . Probably not the same So the exhaust valve stem at the top of ex guide is below the push rod or other drain hole , when you shut car off and cover is overfilled , it runs slowly down exhaust valve which usually has no oil seal at all . If valve is open , this partially fills chamber , smokes like crazy then ok . . Rear cylinder only , as it is lowest . This is very subtle took a while to find, you think things like rings and intake valve seals , even considered adding seals to exhaust? Changing those things had no impact at all (!!) How it was found: persistent weeping of oil at rear corner of valve cover , and ( the breakthrough ) we noticed raw oil on cyl head at / under exhaust manifold port and on heat riser valve If ex valve is closed ( love the IF) oil pools behind exhaust valve head , runs out exhaust port . You start , again huge smoke . Saw smoke rising from exhaust manifold area , as it burned off near port Impossible to clear drain with pressure , had to pull heads and drill block , passage was full of a very hard coke like material . Had to buy a bit long enough . Block was spotless inside , prior owner rebuilt it, he gave up over this .Shop had boiled out block did not notice this hard clog apparently . Ran like a top after clearing … Not sure about other blocks but this is very real . Took a few weeks to figure out, thoughts of cracked heads etc One of many many issues with this car — now a favorite 290 hp 325 dodge poly , identical block to 315/ 325 d500 , not sure if hemi head has sideways passage, preventing drilling from valve cover . Big heads up ! jg On May 29, 2025, at 8:34 PM, Anthony Doughty <62red300h@xxxxxxxxx> wrote:
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