What endgap should I use on Hyper Speed pro 350 flattop pistons? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-24-2009, 04:24 PM
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What endgap should I use on Hyper Speed pro 350 flattop pistons?

Hello guys I was reading an article on hypereutectic pistons and how they need bigger endgapes on the top ring as compared to other cast and forged pistons. I got a set of Speed Pro Hypereutectic pistons for a 350 small block chevy and they said on summit's website they work with normal ring end gaps. They are H345np speed pro pistons. I looked in my box and they say nothing about having to have a bigger ring end gap. I got some Summit moly rings for my build and they are not the file fit kind. I am going to get my new 4 inch bore block re honed just so slightly for a moly ring cause I don't know if Gm honed it for them kind of rings. All I know is it has a crosshatch finish. I have no idea yet what my final gap result will be. Thanks for any help.
Eric

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Old 02-24-2009, 04:50 PM
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On a normal street engine build, stock end gaps are ok with that piston. The top ring is in normal position. The problem with end gaps gets worse as the top ring gets closer to the piston deck (as Keith Black type) or exotic fuels/superchargers are used.
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Old 02-24-2009, 04:55 PM
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If you think you might ever use nitrous in the future, or if it is going to be run hard for a good distance (like circle track or mudding) open the gap .004"-.006" from speed-pro's specs.
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Old 02-24-2009, 05:12 PM
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Hello thanks for the info I am not using it for any racing or anything just a daily driver and the occasioinal getting on the gas a little bit thats all. I was thinking that about the ring lands being in the normal place.
Eric
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