Thread: What pistons are in my 390
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Old 06-06-2020, 04:06 PM
6TNCRZY 6TNCRZY is offline
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Location: Frederick, CO
Cobra Make, Engine: ERA FIA 2158, ERA 427SC 649 sold
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That looks like 9.5 pistons, as I remember from 40 years ago the 10.5 pistons were flat top with 4 valve reliefs.
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