Found some markings on the rods.
So I’m an old timer that’s just getting back into the LS hobby and I remember way back in the early 2000’s there were a couple TSBs out for piston slap and oil consumption issues in 4.8, 5.3, 5.7, and 6.0 motors at the time. While I don’t know the exact cause it was speculated that the issues were from either the low tension rings or bores that were slightly out of spec.
I can’t find the TSB info anymore but I believe GM actually replaced the pistons in some of these motors with pistons that had coated skirts and or rings. The early LS motors did not have OE coated skirts.
So if I had to guess either that engine was a slapper or a heavy oil consumer at some point and they at a minimum pulled the pistons to rering it if not put new slugs in. Thus the date on the cap.
As for the 0300. That’s either a tech employee ID or possibly the tech wrote the root reason he was in there P0300 (multiple cylinder misfire) which could trigger if the slap was bad enough or it was consuming enough oil. These are all SWAGs (sophisticated wild *** guesses). But that’s what I’d tell myself.
I can’t find the TSB info anymore but I believe GM actually replaced the pistons in some of these motors with pistons that had coated skirts and or rings. The early LS motors did not have OE coated skirts.
So if I had to guess either that engine was a slapper or a heavy oil consumer at some point and they at a minimum pulled the pistons to rering it if not put new slugs in. Thus the date on the cap.
As for the 0300. That’s either a tech employee ID or possibly the tech wrote the root reason he was in there P0300 (multiple cylinder misfire) which could trigger if the slap was bad enough or it was consuming enough oil. These are all SWAGs (sophisticated wild *** guesses). But that’s what I’d tell myself.
Last edited by kossuth; Oct 15, 2023 at 07:33 PM.
So I’m an old timer that’s just getting back into the LS hobby and I remember way back in the early 2000’s there were a couple TSBs out for piston slap and oil consumption issues in 4.8, 5.3, 5.7, and 6.0 motors at the time. While I don’t know the exact cause it was speculated that the issues were from either the low tension rings or bores that were slightly out of spec.
I can’t find the TSB info anymore but I believe GM actually replaced the pistons in some of these motors with pistons that had coated skirts and or rings. The early LS motors did not have OE coated skirts.
So if I had to guess either that engine was a slapper or a heavy oil consumer at some point and they at a minimum pulled the pistons to rering it if not put new slugs in. Thus the date on the cap.
As for the 0300. That’s either a tech employee ID or possibly the tech wrote the root reason he was in there P0300 (multiple cylinder misfire) which could trigger if the slap was bad enough or it was consuming enough oil. These are all SWAGs (sophisticated wild *** guesses). But that’s what I’d tell myself.
I can’t find the TSB info anymore but I believe GM actually replaced the pistons in some of these motors with pistons that had coated skirts and or rings. The early LS motors did not have OE coated skirts.
So if I had to guess either that engine was a slapper or a heavy oil consumer at some point and they at a minimum pulled the pistons to rering it if not put new slugs in. Thus the date on the cap.
As for the 0300. That’s either a tech employee ID or possibly the tech wrote the root reason he was in there P0300 (multiple cylinder misfire) which could trigger if the slap was bad enough or it was consuming enough oil. These are all SWAGs (sophisticated wild *** guesses). But that’s what I’d tell myself.
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Of all the LS engines I’ve been in, I’ve never seen the paint pen marks myself, but there have been a couple different threads here, made by folks who have come across an LS with paint pen markings on the caps. My theory is that it’s a warranty job as described above.
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