Blown Engine

[Bigbroadjumper]

Help, I was out in my boat today and I had a spark plug get blown apart. I was running at about 3800 - 4000RPMs when I heard a sound almost like an exhaust leak. I slowed down a shut off the motors. I looked in my blige and one of my plug wires was laying in the bilge. I reached under the manifold and only half of the plug was still in the block the other half was also in the bilge. I did not try to restart the motor, and have no idea what could have happened. The motors are SBC with about 600 hr. I had good oil preasure and my oil temp was good and the motors were running at about 140o. Does anyone have and ideas on what may have happened?
Thanks Bob

[Owen]

At some point when you changed or looked at your plugs you had the socket slightly off center
which caused a micro fracture in the insulator. When the plug heated up, this stressed the
facture enough to completely break away. No biggy.

[Frank Civitano]

Thats what it sounds like! Put a new plug in and fire back up!

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Frank Civitano

[Bigbroadjumper]

You guys are the best! New plug no problem! Thanks. Bob