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Re: Engine knock after carb change


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Posted by JDBRIDER on August 12, 2019 at 18:15:21 from (68.191.176.78):

In Reply to: Engine knock after carb change posted by Morgan in ar on August 11, 2019 at 19:52:07:

Do you think you may have gotten some small debris into the manifold? In my High School days I had a 56 Chevy with a 265 V8. I took the carb off, don't remember why. Anyway on those old cars there was an exhaust passage up thru the intake manifold to the bottom of the carb to prevent carb icing. When I took the carb off 2 of the mounting bolts twisted off. They were burnt nearly in two because of the exhaust ranning thru there. I carefully drilled out and retapped the bolt holes. Everything went OK til I started the car. It knocked something awful. I quickly shut it off. I couldn't imagine what had happened. I went to town to my local service station and asked them what it could be. They said that I had probably let a few drillings fall into the manifold and they got sucked into the cylinders. There they got hot and were glowing causing pre ignition. I couldn't imagine that could cause such a loud knock.
They said to just start the car and let it idle til the drillings burnt away. I let it idle and knock for a few minutes then all was fine.


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