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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: dieselman123 on May 31, 2014, 08:02:41 am

Title: ring gap
Post by: dieselman123 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

Title: Re: ring gap
Post by: bake74 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.

Title: Re: ring gap
Post by: Big Katz 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