12-02-2016, 07:52 PM
Join Date: Jan 2011
My guess is a intake valve stuck open and when the cylinder fired it blew into the manifold. I had a back fire on start up a long time ago after the truck sat at the airport for three weeks. And again on the way out of the parking lot. Didn't break the manifold, but I think it was a close call.
In your case I would do a compression check before firing the next time.
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