Quote:
Originally Posted by crom9111
Sorry but already have a lot of the top end dis assembled  so no sound. It sounds like a tappet sound if you amplified it a lot. It's really loud. It is rhythmic i.e it is in time with engine speed. I changed the oil just 3 days ago at its usual 3000 miles. No engine codes ( hard or soft ) and no other indications of a problem. As a kid I bent many a rod in my 350s from over reving them and it is a similar sound just louder. I've had valves not pump up until you increased the rpms but the sound now just gets louder. I guess my concern is, would a problem on the bottom end transfer that much sound to the top. I plan on getting the lifters out tomorrow and if that doesn't lead anywhere then I guess check the rod bearings. Is there a way a valve could break at the "flange" and cause the noise? |
In my opinion a bearing knock is a little different than a tappet sound and I would think a broken valve would cause a hole in the piston. How do the spark plugs look, any beat up??? I would say yes that the sound could migrate to the top end.
Let us know what you find.
Good luck