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Author Topic: ring gap  (Read 2347 times)

Offline dieselman123

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ring gap
« on: May 31, 2014, 08:02:41 am »
Hey guys I'm building a 355 with vortec heads. The block is bored .30 over and I checked my ring gaps and the top two were .020  on. All cylinders. Is it ok the run the ring like that. I bought the rebuild kit from summit which included the rings. Also by the pistons that came with the kit being hypereutectic pistons which are aluminum I heard that they require a bigger gap. Please help. Motor is gonna be in 83 c10 with standard rear end and with 700 r4 tranny. Thanks in advance
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Offline bake74

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Re: ring gap
« Reply #1 on: May 31, 2014, 10:12:13 pm »
     Did you contact Summit to see what there tech dept. said, or a local engine building shop ?  Sorry, I know that is not what you wanted to hear but I am no engine builder.
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Offline Big Katz

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Re: ring gap
« Reply #2 on: June 02, 2014, 03:18:08 pm »
You would need to contact the piston manufacture to know for sure. Kieth Black hypereutectic pistons do require a larger ring gap due to the fact that the ring is closer to the top of the piston and gets hotter than a top ring on a stock piston. They have a formula based on your bore diameter. It can be found on there website.

https://www.uempistons.com/installation_instructions/kb_installation.pdf
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