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Old 11-16-2010, 12:41 PM
DT1 DT1 is offline
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Ring gap for hypereutectic pistons.

Hi, everyone. This is my first post but I've been lurking for sometime and have found some very knowledgeable and interesting information here. I have many years of experience rebuilding Ford/Chevy small blocks and I usually shoot for stock. I also know that this is a hot rodders forum but I can't think of a better place to have my question answered.

I would like some advice from anyone that has experiance fitting rings for hypereutectic pistons.

I am rebuilding the engine for my 71 Chevy C-10, 350 SB, Bore .020 over, Mild RV cam, 8.5:1. Other than that, stock street and I'm installing Silv-o-lite hypereutectic pistons with a coated skirt. At first I was supplied with Hastings Moly rings but the gaps are close to .030 and I can clearly see, with my necked eye, that some of them are clearly not parallel. I returned them and ordered a set of Sealed Power .025 file fit, Plasma Moly rings.
After doing some research I'm getting conflicting information on the proper gap for top and second rings and was hoping that someone here can help me.
First off; Are "Silv-o-lite" pistons made by KB or do other manufacturers make them as well? The box that mine came in states Silv-o-lite but doesn't state the name of the manufacturer.
What is the proper formula for setting the top and second ring? I have always gone with .004 X 1.00 bore for top and .005 X 1.00 second for standard rings.
I'm reading things like "Top ring wider" "Second ring wider" and it's a bit confusing.
Also do the oil rings need any kind of special consideration?
Any input from some of you that have experience with this
combination would be greatly appreciated.
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