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Larry Lahmann (aka ORHotrod) [ View ] [ ORHotrod@hotmail.com ] [ Car Ads ] [ Blogs ] Salem, Oregon (503) 581-6150  Larry

I'm rebuilding my 1st sbc. It has 30 over bore ring's gap at .015 out of the box. Is that enough?? My Chilton's manuel says .010-.020 Top ring and .013-.025 2nd ring. If needed I will file them. What is the gap suppose to be. They are Sealed Power moly chrome.

Comments

Posted by Streetrodder007  -  08/07/2007 06:55 PM .015 is real good, you do not want them too tight or they can break when the piston expands. Too loose and you will loose h.p. I use Moly rings for most all of my builds, with a good crosshatch on your walls they will seat upon break in, with in 20 minutes. Total seal rings work different, alot of money for a very small extra h.p. 1 important thing to measure is piston to side wall clearance. Alot of good machinists will not bore a block until they have the pistons to measure. And ALWAYS, ALWAYS plasti-gage every bearing dry. Its cheap insurance. Even if you check 1 or 2 caps and they look good at .0025 . I have had another journal turned down to far, say .005 and you will end up spinning a bearing and have to tear most of the whole damn motor apart. For the few extra minutes it takes. I promise it will be worth it. Streetrodder007 [ View ] [ Email ] [ Blogs ] [ Car Ads ] Port Huron, Michigan Charter Member since April 2006   Posted by ORHotrod  -  08/07/2007 07:05 PM Thank's for the quick reply. I did have the pistons at the machine shop when they bored the cylinders. I also plasti-gaged all rod's and main's. Rod's showed .0015, Main were .003. Seem's to be good The crank only got a polish and is standard size. Rod's were resized also. Larry [ View ] [ Email ] [ Blogs ] [ Car Ads ] Salem, Oregon Charter Member since July 2002   Posted by robymarks  -  08/07/2007 11:24 PM Don't forget to slide the bearings into the saddles in a circular motion. Don't set them into the saddle in a simple pushing motion. robymarks [ View ] [ Email ] [ Blogs ] [ Car Ads ] Houston, Texas Charter Member since October 2005   Posted by hotrodgene  -  08/08/2007 09:37 PM I would say perfect fit Gene Riffe [ View ] [ Email ] [ Blogs ] [ Car Ads ] Saint Petersburg, Florida   Posted by ORHotrod  -  08/09/2007 02:14 AM Thank you guy's, I put it together today. I won't be able to know how well for a while it's for my Model A project that I've just started. I'll keep it pre-oiled by running the oil pump at least once a week. Thank's again for the comments. Larry [ View ] [ Email ] [ Blogs ] [ Car Ads ] Salem, Oregon Charter Member since July 2002

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