MustangVixenGT

Holly smokes! Hope you get it fixed soon.

JimC

Very strange, spacer doesn't do anything so it couldn't contribute to that. Flowmasters could only cause back pressure if they broke internally and blocked the exit. Wonder what caused your crankcase to build that much pressure? It takes a lot to break the valve covers.

teetertotter

Yes, Serpentine is what meant to say. Stand corrected. Thanks!

Nuke

I've never seen valve covers blown off, period. Nasty!

Please don't transfer that TB spacer to the new engine. TB spacers are a joke and you'll have to turn in your man-card if you do.

turbo 2.8

perhaps a combination of blow by and gunked up pcv valve? just guessing since I've never seen this before.

kevinmalec

Wow, this is the first I've ever heard of this issue.....
Makes me think my slow head gasket leak isn't all that bad.
Good luck with the fix!

IvanRad

doesnt look that bad dude. just ducktape it
jk i really hope you find out why this happened

Rudolph Hucker

crankcase pressure.
possibly a broken piston ring..

tx_zstang

I find that hard to believe that it was only crankcase pressure. But, as Rudolph mentioned, broken or non-sealing rings would cause an intense pressure spike when the spark ignites a charge, and much of the force bypasses the piston and has to go somewhere; the weak points of containment are the plastic value covers and ventilation hoses.
Is the driver-side value cover hose intact? Even if the pcv valve was clogged and completely closed, mild pressure would feed back through the driver side to the intake tube. Normally, the pcv valve does not close all the way on these cars, in any position (unlike older-school pcvs that would actually seal and close).

What oil was being used, and what condition was it in? How cold did it get, too?

2005Redfire6

Holy ****! That is insane, curious to find out what ultimately caused that.