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Old 04-05-2009, 11:31 PM
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ring gap ?

hey everybody im new here but iv found a lot of answers here in the past by searching gooogle and yahoo, so heres the skinnie iv just bought a machine shop fresh .060 over 350 from a guy that decided to go bigblock this 350 has been sitting in his garage for bout 3 years still wrapped in plastic it looks like the machine work was done yesterday,it came with block,crank, pistons and rods the pistons are new ft but he didnt remember if they where cast or hypereutectic the only numbers on them whatsoever is .060 thats it and iv heard hyper pistons run a bigger gap on the top ring so i was wondering if its a smart idea to run a bigger gap even though they could be cast or if there cast will this be a problem im putting this motor in a foxbody mustang its mostly a street car with some weekend dragstrip dutys but it will never be turned over 5800rpm thannk you and im sorry if i sound like a retard

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Old 04-06-2009, 09:36 AM
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It depends on who made the hyper piston. Speed pro`s don`t require a larger gap. KB pistons do require a larger gap due to the top ring being closer to the top of the piston which makes the ring run hotter so it expands more, thus the need for more end gap.
If the piston just has .060 on the tops and nothing else, these sound like stock cast replacement "rebuilder" pistons which have .020 removed from the compression height, if these are the pistons you have then I`d get rid of them, they kill compression and Quench.
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Old 04-06-2009, 09:43 AM
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