Piston ID

[green440duster]

Hey Guys; I need help finding out the compression ratio of these pistons I just pulled from a 360. They are 0.040 over and appear to be cast aluminum low compression flat tops. They are TRW 2380P but I cannot find out any info (CR) on them. Can any one help?

Thanks

 

[stroker416]

i think:

63cc = 9.19
65cc = 8.99
68cc = 8.71

 

[green440duster]

Thanks