1997 gmc sierra with 454. 90,000 miles.I have Listened to videos and sounds and it sounds like the same noise this engine is making. after the engine is warmed up for about a minute piston slap stops. lately when at a sop engine spudders during acceleration. is this due to the "Piston Slap".|||Alot of the time, you hear the bearings because oil is slow getting there. Try switching to a different oil. I'd try something along the lines of 5W30 with a Wix brand oil filter. I would suggest Royal Purple or Amsoil. I bet you this will shut it up permanently, as I've seen and heard this in other people's engines ALOT.|||Piston slap is common especially with GM engines. It will not hurt anything according to GM. I think they said that to keep from replacing engines under warranty. (3.1L, 3.4L, 6.0L) engines are really bad with that, Escalades have it really bad. My opinion, it shouldnt be making any noises but we cannot replace engines just because of piston slap if we cannot find the cause of it which in most cases you cannot see(No bearing issue, of any of the issues from what they said above)|||Sounds more like a mushroomed bearing on the connecting rod sometimes referred to as "piston slap" The bearing flattens out and gets wider creating a gap between the connecting rod and the crank. Once warm, the metals expand making the gap smaller and the noise somewhat goes away. A quart of Lucas oil will help, but sounds like u need a crank and bearing kit. The spudder has nothing to do with this. Different problem.|||the chances of your big block having piston slap are pretty slim. When a piston starts to slap against the cylinder wall, it rarely goes away after warming up ( IMHO ) now if you do have piston slap, most likely that cylinder would be dead or very low on compression causing your engine shudder|||Yes

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