Factory coated pistons?

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Apr 18, 2013 | 05:00 AM

Quick Ranger

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Factory coated pistons?

Did the factory ever install a piston with black coated skirts on the 5.3? I have another thread going about the mismatched rods, but i wonder if these are factory pistons. I've looked the numbers up off the top, but have found nothing. On the top of the piston it is marked: H267 07 106 A5, 81061E, on the bottom: 810308 425P. What makes me wonder is, the ealier 5.3 pistons i have from another motor, aren't coated, and have what appears to be a big plus sign in the dish.

Apr 18, 2013 | 06:11 PM

Quick Ranger

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No ideas?

Apr 18, 2013 | 06:43 PM

gvnick

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I have the aluminum 5.3 (LM4), which had dished pistons like the LM7. I have read that these motors had coated pistons for noise reduction, but I can not verify.

Apr 19, 2013 | 03:39 AM

Quick Ranger

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I can't verify any info i these pistons, i guess i'll just replace them with a Speed Pro piston. May as well get 4.8 pistons to pick up some compression. These rods and pistons will go in the trash.