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Old Jan 13, 2005 | 05:24 PM
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jethro bodine's Avatar
jethro bodine
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pistons

pulled the heads off my 390 today, i have pistons that are flat with a circle in the middle dished out, do these lower the compression, anyone know what type these are?, also i have a crower cam stamped K-31. anyone know anything about it, thanks.
 
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Old Jan 13, 2005 | 06:01 PM
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I believe they are low compression pistons. Nothing special. I would type "Crower k-31" in a google search or something and see what you get usually by putting things like this in you can figure it out. Its what i do with all my older electronics like stereo equipment so i can get product support.
 
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Old Jan 13, 2005 | 06:07 PM
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What year motor is it? I know when i took my 64 390 apart it had a little dish in it, but was a 10:1 compression motor.
 
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Old Jan 14, 2005 | 12:32 PM
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yea it all depends but more often than not a dish will net lower CR. It all depends on the CH of the piston too.
 
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