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The intake manifold fitting has two nipples. One is hooked up to the distribution center, and one apparently has no function. I capped it off, only to find the cap gone a little later. So I capped it off again and zip tied it. Just curious how it could "blow" off, since I assumed the nipples on that fitting always sucked. Basic engine 101, but does the manifold sometimes blow?
 

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It will if it backfires. When one of my exhaust rockers came off it started rapidly backfiring through the carb. It blew every vacuum line and cap of my intake and carb.
 
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