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I saw the same thing on a pulling tractor some years ago. The guy I saw had a GMC style blower and hilborm fuel injection. He feathered the throttle which reduced the air intake, but the injectors kept dumping the same amount of fuel. When the throttle opened up and all that air hit the vaporized fuel, it blew both heads and the manifold off the engine.
I can't tell if it was the same scenario, or not.
Glad my hand wasn't on the manifold when it blew...
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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags
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