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Old 03-21-2003, 05:14 PM
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Post KB pistons ring gap?

I am getting ready to assemble my sbc 355, 30 over and have a couple ?'s ...I don't have a ring filer... everybody I've talked too says do it by hand...clamp a file in a vise and go to it...I plan on being careful, but can see that it will be impossible to stay perfectly square...is this good enough?
I am using keith black pistons and will be running the car on the strip....by their table...4.030 bore x 0.0075 = 0.030 ring gap....nitrous could be in the mills future...depending on how it runs...the gap for drag nitrous is 0.038, do I go for that and give myself the extra thousandths with the chance that I may not go with nitrous? I don't want any problems with butting the rings...but don't want too much gap either....rings are speed pro plasma moly 1/16"...and does anyone know what second ring and oil ring gaps are?...there were no papers with the rings....or a speed pro link.....


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Old 03-21-2003, 05:35 PM
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The ring ends need to be square. It should not be that hard to get them spuare by hand, but it will certainly take longer. I am not sure that all rings are the same, but I used .018 on my childs albert second ring as recommended, if memory serves. It will not see near the heat of the first ring, so it does not need as much gap. I think if you are seriously concidering runnning nitrous you need to go with the wide gap. The oil ring should not need filing.

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Old 03-21-2003, 06:07 PM
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use a minimum of .016 on the second ring, just check the oil rails anything over .010 is ok.
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Old 03-21-2003, 06:12 PM
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I've got the same rings and they came with <a href="http://a9.cpimg.com/image/29/32/16722729-b5f3-00E50200-.jpg" target="_blank">these instructions</a> for gap.
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Old 03-21-2003, 06:56 PM
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I put the KB's in my wifes nova. Set them up for nitrous. Haven't added it yet though. It runs well with the wide gap. I filed the gap by looping a piece of emery cloth over a piece of flat steel. When I felt the gap was close I put the ring in the respective bore to measure and to check squareness of gap and corrected as needed. Took a little longet than using a ring filer but sometimes necissity is the mother of invention. Hope this helps
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