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Old 09-04-2011, 06:39 PM
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Ring Size ?

If my cylinder bores are 4.0495 would the rings be .30 over on sbc 350 ?

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Old 09-04-2011, 07:56 PM
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Lets see. Stock bore of a 350: 4.000 inches.
Now if it`s bored .030 over the bore would be 4.030
Now, add it up.
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Old 09-04-2011, 08:42 PM
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Check your readings again. Common overbore sizes for 4" bore are +.020, .030, .040, .060, .080" your bores are not usable as they read now..
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Old 09-04-2011, 08:50 PM
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Quote:
Originally Posted by BOBCRMAN@aol.com
Check your readings again. Common overbore sizes for 4" bore are +.020, .030, .040, .060, .080" your bores are not usable as they read now..
I agree,it is almost .050 over size. I have never heard of that size. I guess you could get them custom made but big bucks.Maybe it is a well worn .040 over that he honed out?
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Old 09-04-2011, 08:56 PM
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I used a telescopic bore gauge and quality digital micrometer and they were all around 4.050 average the cylinders have very little piston ridge also the motor had less than 10,000 miles on engine bearings were ok same with mains. so ok obviously it's over bored between .030 & .060 thats why I asked seemed odd but thats what it is.
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Old 09-04-2011, 08:59 PM
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Measure your pistons for this motor, if you have them. Something is very wrong..
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Old 09-04-2011, 09:02 PM
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Measure the bore towards the bottom. Somebody may have made 8 large funnels with a ridge reamer and a de-glaze hone..
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Old 09-04-2011, 09:05 PM
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Wouldn't be the first time. haha
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Old 09-04-2011, 09:13 PM
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I'm going to re check the cylinders again maybe I made a mistake? yes I have the pistons I'll check one as well. The motor had just been rebuilt but unfortunately it was left with open exhaust ports and no distributor and when I pulled the pan there was a bunch of rat **** in motor, so I tore it apart there was rat turds everywhere. I'm going to thoroughly clean it and wanted to re-ring and new bearings hell the cylinders are still cross hatched. Just don't get the bores. motor had new acl tri metal main & rod bearings @ .010 which looked like they sucked some dirt but very very little.
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Old 09-04-2011, 09:15 PM
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I checked the bores top to bottom
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Old 09-04-2011, 11:38 PM
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And...?

Are the pistons stamped with their OS?

Check your P/W clearance, what is it?
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Old 09-05-2011, 11:50 AM
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Well the piston mics out @ 4.030 so the pistons are oversize although they are not stamped "os" piston number is 8222 4 made in canada there is a "n" in a circle and 45K as well
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Old 09-05-2011, 12:27 PM
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Was this engine used as a hot rod motor? Many moons ago, people used to build them 'loose' because it was believed to help them run more free. True to a point. Had an engine once that had .009 piston clearance and it ran pretty good but it surprised me that it had so much when I tore it down at the end of the drag racing season.
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Old 09-05-2011, 12:28 PM
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Sure it's an N? Zollner was a Canadian piston manufacturer. Great products and a circleZ. Too bad their automotive pistons are no longer produced like those.

It was somewhat common to run excessive clearances on the old style "Forged" racing pistons. The material and skirt designs were not near as good as present stuff.. Used to run .008"+ on bbc race stuff. Cast pistons, as these are, very rarely run more than .0025" anymore..

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Old 09-05-2011, 01:46 PM
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They are Zollner pistons it is a "z" just depends on which way you looked. So could I use .20 rings and check ring end gap clearance since the bores just under 4.050 or would this be an issue
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