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Ford Mustang fastback GT390
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Discussion Starter #1
Just thought I’d post a pic of a blown head gasket in my 351c a couple of years ago, just wondering what would have caused it. I bought the car knowing that something was wrong, it was blowing huge amounts of smoke out of the oil & breather caps, at worst I thought it was piston rings, any one out there had a head gasket blown like this. ??
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01225D96-F148-498F-A2F8-BD74377DAD66.jpeg
92D0857F-7F15-473B-9606-51DA18C05C4B.jpeg
 

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Maybe the intake was over tightened. The intake manifold bolts are at a angle to the intake manifold side of the head. When you tighten the intake bolts they tend to act like a wedge lifting the top part of the head off the block. For performance use it's common to tighten the top row of bolts about another 10 pounds as I recall to counter the effect. I'm not saying this was the cause in your case but could have
 

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Every blown head gasket I've seen was blown in the narrowest part of the gasket between 2 adjacent cylinders.
 

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@awhtx yeah I had one do that between #7 and #8 , and on the 289 / old 302 firing order that makes for a ROUGH running engine. I have also seen them blow near a cooling passage that made boat-load of steam in the exhaust, or between a cylinder bore and the exhaust crossover...What a racket !!
 

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Discussion Starter #5
Yeah, I thought head gaskets mostly went on the cooling passages, I was just glad it wasn’t something more serious, a cheap fix.
 
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