Olds 455 ring gap question

Old August 7th, 2018, 05:55 PM
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EJC
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Olds 455 ring gap question

Ok, crank is torqued down with new ARP bolts to ARP spec. I have a set of KB277-60 pistons and cast Hasting rings 661 I believe. Top ring gaps are at .020 to .021 within Hasting gap spec but KB is showing .026 Hastings was .014 to .022 for there specs. Which way should I go?
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Old August 7th, 2018, 06:22 PM
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You need to go with the KB specs. Those pistons hold a lot of heat and need a larger gap. Improper ring gap causes major problems with those pistons
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Old August 8th, 2018, 05:55 AM
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Thanks, I noticed the KB rings have a moly top ring different from the Hastings rings I have. Do the specs for ring gap for the KB277 hold true for both ring types? Probably overthinking it but thought I would ask before putting it together. I try to live by the 6 Ps.
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Old August 8th, 2018, 06:17 AM
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Material is irrelevant other than for wall finish.
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Old August 8th, 2018, 06:19 AM
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Perfect.
Thanks guys.
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Old August 9th, 2018, 05:07 PM
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Just have to ask why on earth you would use a cast ring instead of moly ? That being said you definitely have to go with the KB specs on ring gaps. I usually add a couple of thousandths to that.
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Old August 10th, 2018, 06:51 PM
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Ok, what ringset do you suggest? I see Hastings sell a chromemoly "coated" set. Researched KB but can't find the .060 rings on there site. Part number would be great.
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Old August 10th, 2018, 07:02 PM
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Originally Posted by EJC View Post
Ok, what ringset do you suggest? I see Hastings sell a chromemoly "coated" set. Researched KB but can't find the .060 rings on there site. Part number would be great.
Hastings 2M661 .060
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Old August 10th, 2018, 07:05 PM
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Originally Posted by EJC View Post
Ok, what ringset do you suggest? I see Hastings sell a chromemoly "coated" set. Researched KB but can't find the .060 rings on there site. Part number would be great.
I use the Hastings Moly rings in just about every naturally aspirated engine I build. They seat while on the engine stand as long as the cylinders are finished correctly and last forever.
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Old August 10th, 2018, 07:07 PM
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My math says .027 for the top ring gap. You mentioned to open them up a few more thou though right.
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