Man talking about a cracked head.

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pittsburghracer said:
Never saw one this bad. Not sure you can watch the Facebook video.

My shop neighbor is always finding new and creative ways to explode engines. First time seeing one like this! 427in. LS in an SN95 Cobra dedicated drag car, was running 32psi on methanol when it split the head in half. #dragcar #Ls #lsengine #mustang #sn95 #v8 #dragracing #ford #gm #chevy | Tommy Reichelderfer | Frankie Valli · Grease

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My first thoughts were with regard to how well the chamber is executed! Second came the thought of what the HxLL kinda-dynamite was in the chamber to cause that. I'm also wondering if how raised the o-ring is was a contributor.
 
I doubt the o-ring is the cause of the problem. Most heads are o-ringed because of higher compression and/or boost pressures. I know that Ed Hamburger told me to o-ring the heads on my 273 when I was running north of 11-1 compression. It stopped me from blowing head gaskets, which happened on a regular basis prior to having the o-rings done.
 
ValiantS said:
My first thoughts were with regard to how well the chamber is executed! Second came the thought of what the HxLL kinda-dynamite was in the chamber to cause that. I'm also wondering if how raised the o-ring is was a contributor.
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I think 32 pounds of forced pressure had a lot to do with it.
 

 
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