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Ring gap 413

0.010"-0.020" good rule of thumb. Guaranteed to be close to the max out of the box for a stock set of rings. If you are putting stock rings back into a 60 year old engine without boring, just install the rings because you won't like what you will measure...
 
The old rule of thumb is 3 thousands per inch of bore.
Always check your ring gaps. If they are too big - nothing you can do about that.
If they are too small - the engine will give a big problem pretty fast.
 
The old rule of thumb is 3 thousands per inch of bore.
Always check your ring gaps. If they are too big - nothing you can do about that.
If they are too small - the engine will give a big problem pretty fast.
Ring manufacturers for stock OEM rings will be at about the max, and if the bore is worn out, it WILL be even worse (larger). Yes, larger is better than smaller, but a stock ringset will never be on the small end. Now, a file to fit set will be smaller and will require filing to the required gab, but the OP referred to a plain jane OEM set of rings, not a HP set. And yes, most domestic old school engine specs will be 0.010" to 0.020" or 0.010" to 0.022". Don't believe me, reference a shop manual...
 
You are quite right with info you have given.
IMO not checking to ensure you have ring gap while assembling the engine was not good advice.
 
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