New short block scratches on cylinder walls after installing pistons - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

FerkLS3 · 02-09-2023, 11:22 PM

Hello, this was my first time gapping rings for a 416 thats going to see a lot of boost, I took my time grinding down all the rings with a stone and then deburring them and putting a slight bevel on them. after assembly I have some up and down scratches on the cylinder walls very light, the ones where gaps are are slightly more visible, but there are many smaller ones. none of them catch a nail and none of them can be felt at all you can just see them. pistons installed dry with a light touch of oil on skirts. Am I just being paranoid and is this normal for a freshly bored and honed block and new diamond pistons and rings? Thanks in advance for any input

Tommi · 02-10-2023, 01:23 AM

I think those "scratches" mean nothing, but next time use lot of oil when installing pistons into cylinders.

morepowerjoe · 02-10-2023, 04:13 AM

Yes sir you need to oil the entire piston, rings, and cylinder walls when installing but I don't believe those scratches will hurt anything but definitely not good. Here's a picture of mine when assembling.

Name: 27 cylinder.jpg
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Name: 27 cylinder.jpg
Views: 506
Size: 358.6 KB

FerkLS3 · 02-10-2023, 07:19 AM

Quote:

Originally Posted by morepowerjoe

Yes sir you need to oil the entire piston, rings, and cylinder walls when installing but I don't believe those scratches will hurt anything but definitely not good. Here's a picture of mine when assembling.

Attachment 1120215

Thanks for the responses guys. Just weird how this is on every cylinder. a light film was applied to each bore with my break in oil, everything moves so smooth. I removed a couple of pistons to see if skirts were rubbing and they are not, everything is perfect. I feel like im probably being to paranoid about this and I should just roll with it just wanted some other eyes on the issue.

Aqua Blue RS/SS · 02-15-2023, 01:10 PM

Run it, Those are likely just superficial scuffs, it happens from time to time. Use a ton of oil stuffing the pistons into the cylinders, if in doubt always heir on the side of using more oil. It can also be caused by the ring compressor not being set tight enough and causing the ring gap to grab on the deck as it goes into the bore.

02-09-2023, 11:22 PM	#1
FerkLS3 Drives: 2010 2ss Cyber Gray Join Date: Feb 2022 Location: Ohio Posts: 8	New short block scratches on cylinder walls after installing pistons Hello, this was my first time gapping rings for a 416 thats going to see a lot of boost, I took my time grinding down all the rings with a stone and then deburring them and putting a slight bevel on them. after assembly I have some up and down scratches on the cylinder walls very light, the ones where gaps are are slightly more visible, but there are many smaller ones. none of them catch a nail and none of them can be felt at all you can just see them. pistons installed dry with a light touch of oil on skirts. Am I just being paranoid and is this normal for a freshly bored and honed block and new diamond pistons and rings? Thanks in advance for any input Attached Images

02-10-2023, 01:23 AM	#2
Tommi Drives: 2010 Camaro SS manual Join Date: Feb 2022 Location: Finland Posts: 29	I think those "scratches" mean nothing, but next time use lot of oil when installing pistons into cylinders. __________________ 2010 Camaro SS, LS3 + 6spd manual. 1975 Volvo 242, 357SBC + 6 spd manual. 1978 Blazer offroader with LS1, 1-ton axles.

02-10-2023, 04:13 AM	#3
morepowerjoe Drives: 2012 Chevrolet Camaro l99 Join Date: Aug 2020 Location: Austin, TX Posts: 2,109	Yes sir you need to oil the entire piston, rings, and cylinder walls when installing but I don't believe those scratches will hurt anything but definitely not good. Here's a picture of mine when assembling. __________________ DSS FX Forged Pistons, Eagle ESP L19 Forged Rods, ARP Head and Main Studs, TSP PRC 260 CNC Ported Heads milled .030, Cometic .040 Head Gaskets, GPI SS3 VVT Camshaft, GM Performance Racing Lifters, CHE Trunnions , Molly Pushrods, Melling 10355HV Oil Pump, Cold Air Inductions CAI, Fast LSXR Intake Manifold, Nick Williams 103 TB, TSP 1 7/8" Longtubes with 3" TSP Exhaust, ZL1 Fuel Pump, Mishimoto Radiator, Mishimoto Oil Cooler, Tru Cool 40k Tranny Cooler, 3600 Circle D Converter, Fluid Dynamics Balancer Build Thread https://www.camaro5.com/forums/showthread.php?t=609817

02-15-2023, 01:10 PM	#5
Aqua Blue RS/SS Drives: ABM #93 Join Date: Oct 2018 Location: Lotaburger Posts: 2,696	Run it, Those are likely just superficial scuffs, it happens from time to time. Use a ton of oil stuffing the pistons into the cylinders, if in doubt always heir on the side of using more oil. It can also be caused by the ring compressor not being set tight enough and causing the ring gap to grab on the deck as it goes into the bore. __________________ ABM #2399 2SS/RS:SOLD ABM #93 2SS/RS Black Rally stripes, Titanium Interior 4,000 miles: GM GFX side skirts and diffuser waiting on paint, GM dovetail, GM heritage, RPI ZL1 style splitter. ‘87 IROC-Z Iroc blue. all original unmolested with 50K miles.